Subjects -> CHEMISTRY (Total: 928 journals)
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    - CHEMISTRY (661 journals)
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    - PHYSICAL CHEMISTRY (65 journals)

PHYSICAL CHEMISTRY (65 journals)

Showing 1 - 64 of 64 Journals sorted alphabetically
ACS Central Science     Open Access   (Followers: 9)
ACS Physical Chemistry Au     Open Access   (Followers: 7)
ACS Sensors     Hybrid Journal   (Followers: 7)
Acta Physico-Chimica Sinica     Free  
Advances in Image and Video Processing     Open Access   (Followers: 20)
Advances in Physical Chemistry     Open Access   (Followers: 13)
Annual Review of Physical Chemistry     Full-text available via subscription   (Followers: 14)
Applied Materials Today     Hybrid Journal   (Followers: 1)
Biophysical Chemistry     Hybrid Journal   (Followers: 8)
Catalysis, Structure & Reactivity     Open Access   (Followers: 2)
Chemical Physics     Hybrid Journal   (Followers: 18)
Chemical Physics Letters     Hybrid Journal   (Followers: 17)
Chemistry and Physics of Lipids     Hybrid Journal   (Followers: 2)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Colloids and Surfaces A: Physicochemical and Engineering Aspects     Hybrid Journal   (Followers: 6)
Current Physical Chemistry     Hybrid Journal   (Followers: 1)
Doklady Physical Chemistry     Hybrid Journal  
EPJ B - Condensed Matter and Complex Systems     Hybrid Journal   (Followers: 1)
EPJ E - Soft Matter and Biological Physics     Hybrid Journal   (Followers: 3)
Friction     Open Access   (Followers: 4)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 35)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Handbook on the Physics and Chemistry of Rare Earths     Full-text available via subscription   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Chemistry - Section A     Open Access   (Followers: 9)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Quantum Chemistry     Hybrid Journal   (Followers: 5)
International Reviews in Physical Chemistry     Hybrid Journal   (Followers: 3)
Journal of Biophysical Chemistry     Open Access   (Followers: 3)
Journal of Chemical Physics     Hybrid Journal   (Followers: 36)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Macromolecular Science, Part B: Physics     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry A     Hybrid Journal   (Followers: 28)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Chemistry Letters     Hybrid Journal   (Followers: 26)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Quantum Chemistry     Open Access   (Followers: 1)
Journal of Radiation Research     Open Access   (Followers: 3)
Macromolecular Chemistry and Physics     Hybrid Journal   (Followers: 2)
Molecular Physics: An International Journal in the Field of Chemical Physics     Hybrid Journal   (Followers: 24)
Nature Communications     Open Access   (Followers: 322)
Open Journal of Physical Chemistry     Open Access  
Physical Chemistry     Open Access   (Followers: 2)
Physical Chemistry Chemical Physics     Hybrid Journal   (Followers: 29)
Physical Chemistry Research     Open Access   (Followers: 1)
Physical Review A     Full-text available via subscription   (Followers: 23)
Physical Review Accelerators and Beams     Open Access   (Followers: 3)
Physical Review B     Full-text available via subscription   (Followers: 33)
Physical Review D     Full-text available via subscription   (Followers: 11)
Physical Review E     Full-text available via subscription   (Followers: 41)
Physical Review Letters     Full-text available via subscription   (Followers: 134)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Physics and Chemistry of Liquids: An International Journal     Hybrid Journal  
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 10)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Protection of Metals and Physical Chemistry of Surfaces     Hybrid Journal   (Followers: 15)
Revista Fuentes     Open Access  
Russian Journal of Physical Chemistry A, Focus on Chemistry     Hybrid Journal  
Russian Journal of Physical Chemistry B, Focus on Physics     Hybrid Journal  
Solid State Ionics     Hybrid Journal   (Followers: 5)
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics     Hybrid Journal   (Followers: 29)
The European Physical Journal Special Topics     Hybrid Journal   (Followers: 1)
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The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics
Journal Prestige (SJR): 0.387
Citation Impact (citeScore): 1
Number of Followers: 29  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1434-6060 - ISSN (Online) 1434-6079
Published by Springer-Verlag Homepage  [2469 journals]
  • Estimation of distance-distribution probabilities from pulsed electron
           paramagnetic resonance (EPR) data of two dipolar interaction coupled
           nitroxide spin labels using doubly rotating frames and least-squares
           fitting

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      Abstract: A method, based on the doubly rotating frame (DRF) technique to calculate the basis DEER (Double Electron–Electron Resonance) signals [Physica B: Condensed Matter, 625, 413,511 (2022)] accurately by numerical techniques over a range of \(r\) values, where \(r\) is the distance between the two nitroxides in a biradical in a biological system, has been exploited to calculate the probabilities of distance distribution, \(P\left( r \right), \) by the use of Tikhonov regularization. It is demonstrated here by applying it to the data reported by Lovett et al. [J. Magn. Reson., 223, 98–106 (2012)] on a sample of bis-nitroxide nanowire, P1, in deuterated ortho-terphenyl solvent with 5% BnPy (d14-oTP/BnPy) in semi-rigid state. An improvement in the agreement of the calculated signal with respect to the experimental signal and thus in the probabilities of the distance distribution, \(P\left( r \right)\) , so obtained, is found, as compared to that obtained using the kernel signals based on analytical expressions. Graphical abstract
      PubDate: 2022-05-19
       
  • Potassium upconversion violet light generation under two-color two-photon
           excitation to 4D, 6S level

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      Abstract: Two-color nanosecond dye lasers were used to excite potassium vapor cell, and 404-nm violet beam output was observed. This violet beam owns good collimation and transient properties, and its wavelength matches with the transition from potassium 52P3/2,1/2 doublet to the ground state. An analysis process shows that the violet light mechanism is attributed to two-photon-induced 42S1/2 → 42P3/2 → 42D3/2,5/2/62S1/2 transition, 42D3/2,5/2/62S1/2 → 52P3/2,1/2 SHRS (stimulated hyper-Raman scattering), and FWM (four-wave-mixing) processes; this is a third-order nonlinear optics process. Violet light doublet-line intensity ratio was found to change while fine scanning of excitation wavelength; this shifting was thought related to the FWM resonant degree. Potassium violet light is expected to become new tunable light source. Graphical abstract
      PubDate: 2022-05-17
       
  • Laboratory experiments on the radiation astrochemistry of water ice phases

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      Abstract: Water (H2O) ice is a ubiquitous component of the universe, having been detected in a variety of interstellar and Solar System environments where radiation plays an important role in its physico-chemical transformations. Although the radiation chemistry of H2O astrophysical ice analogues has been well studied, direct and systematic comparisons of different solid phases are scarce and are typically limited to just two phases. In this article, we describe the results of an in-depth study of the 2 keV electron irradiation of amorphous solid water (ASW), restrained amorphous ice (RAI) and the cubic (Ic) and hexagonal (Ih) crystalline phases at 20 K so as to further uncover any potential dependence of the radiation physics and chemistry on the solid phase of the ice. Mid-infrared spectroscopic analysis of the four investigated H2O ice phases revealed that electron irradiation of the RAI, Ic, and Ih phases resulted in their amorphization (with the latter undergoing the process more slowly) while ASW underwent compaction. The abundance of hydrogen peroxide (H2O2) produced as a result of the irradiation was also found to vary between phases, with yields being highest in irradiated ASW. This observation is the cumulative result of several factors including the increased porosity and quantity of lattice defects in ASW, as well as its less extensive hydrogen-bonding network. Our results have astrophysical implications, particularly with regards to H2O-rich icy interstellar and Solar System bodies exposed to both radiation fields and temperature gradients. Graphical abstract
      PubDate: 2022-05-17
       
  • Spectral and dissociation characteristics of aluminum chloride in external
           electric field

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      Abstract: Aluminum chloride has great toxicity and threatens the ozone layer. The ground-state geometric structure and spectral characteristics are calculated for various external electric fields via DFT at the B3LYP/6–31 + G(d) basis set level. Aluminum chloride dissociation is directly given by calculating the molecular potential energy curve and potential energy surface. With the external electric field, the structure of aluminum chloride changes significantly. With increase in electric fields, the 1Al-3Cl and 1Al-4Cl bond lengths increase, and the total energy and energy gap initially increase and then decrease, whereas the dipole moment first decreases and then increases. Most vibrational frequencies of infrared and Raman spectra are redshifted. When the electric fields intensity is 0.040 a.u., the 1Al-4Cl bond fracture, which means a dissociation of the molecule. When the electric field intensity is 0.045 a.u., the aluminum chloride appeared on another dissociation pathway, which may be concerted. These results are of great significance concerning the dissociation mechanism of aluminum chloride in external electric field. Graphical abstract
      PubDate: 2022-05-17
       
  • Gauge dependence of spontaneous radiation spectrum in a time-dependent
           relativistic non-perturbative Coulomb field

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      Abstract: Lamb triggered a continuous debate on the gauge choice for atomic interactions with electromagnetic fields, particularly with plane waves and the vacuum field. Modern technologies of Rydberg atoms and relativistic atomic beams make it possible to explore interactions with a more intriguing non-perturbative, adiabatic Coulomb field. In such cases, one would face the well-known tricky issue about the physical significance of the scalar gauge potential when it is time-dependent. We start attacking this issue by studying a simplest system: a one-dimensional oscillator interacting adiabatically with a relativistic charge. We reveal that a gauge dependence much severer than the one Lamb observed is encountered when calculating the transient radiation spectrum of this oscillator by the external-field method, which is currently the only available tool. The obtained peak frequency can differ by 10 MHz or larger for the commonly used Coulomb, Lorentz, and Multipolar gauges. Contrary to the popular view, we explain that such a gauge dependence is not really a disaster, but actually an advantage here: The relativistic bound-state problem is so complicated that a full quantum-field method is still lacking; thus, the external-field approximation cannot be derived and hence not guaranteed. However, by fitting to experimental data, one may always define an effective external field, which may likely be parameterized with the gauge potential in a particular gauge. This effective external field would not only be of phenomenological use, but also shed light on the physical significance of the gauge potential. We thereby encourage further investigations of this fundamental problem with more realistic systems involving Rydberg atoms and relativistic atomic beams, both theoretically and experimentally. Graphic
      PubDate: 2022-05-16
       
  • The scattering symmetries of tetrahedral quantum structures

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      Abstract: The electrons associated with molecules and other small quantum structures exist in states that are bound or quasibound to the molecule. The quasibound states, which can significantly affect chemical reaction dynamics, have finite lifetimes and are associated with complex energy poles of the scattering matrix. Using Wigner–Eisenbud (R-matrix) scattering theory, we examine the symmetry properties of the quasibound states of a molecule-size tetrahedral system, and we examine the relation of quasibound states to the scattering properties. In addition, using R-matrix theory, we construct a non-Hermitian Hamiltonian whose complex energy eigenvalues coincide with the bound and quasi-bound states of the molecule. We show that each bound state and quasibound state of the tetrahedral system belongs to a distinct irreducible representation of the tetrahedral group, and that an incident electron belonging to one irreducible representation can only scatter within the same irreducible representation. Graphic
      PubDate: 2022-05-16
       
  • Optimization of high-order harmonic generation for the time-resolved ARPES

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      Abstract: We experimentally investigated the optimized phase matching condition for high order harmonic generation as a source of time-resolved Angle-resolved photoemission spectroscopy (TR-ARPES) applications. In the loose focusing scheme, we find that the divergence of harmonics decreases with the increase of gas cell length, while the maximum intensity is obtained with 10–15 mm gas cell. Our result shows that stable beam condition with best temporal resolution can be realized for TR-ARPES by using a longer gas cell (longer than 25 mm in our experiment), and an appropriate gas cell length can provide balanced condition for good beam intensity and good temporal resolution. Graphical abstract For the experiments carried out on HHG-based TR ARPES, the wavefront tilt of harmonic beam is inevitably introduced by the grating used in monochromator, leading to the boarding of pulse width and the dramatic decrease of the temporal resolution. A simple way to decrease the wavefront tilt is by optimizing the beam quality of high order harmonics. In our work, we aim to decrease the divergence of harmonic beam while keeping the enough intensity. We have experimentally investigated the intensity and beam divergence of high order harmonics generated in Ar for different gas cell condition. The divergence of harmonics decreases with the increase of gas cell length which is shown in (a), while the maximum intensity is obtained with 10 15 mm gas cell shown in (b). Our result c d shows that stable beam condition with best temporal resolution can be realized for TR ARPES by using a longer gas cell, and an appropriate gas cell length can provide balanced condition for good beam intensity and good temporal resolution.
      PubDate: 2022-05-16
       
  • Goos–Hänchen shift observed from stratified medium

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      Abstract: In this paper, we have theoretically examined Goos–Hänchen shift (GHS) obtained from a stratified epsilon-near-zero (ENZ) medium placed in air. Transfer matrix method is used to calculate GHS for a sandwich structure composed of odd number of slabs. The impact of changing the material permittivity, thickness and number of slabs on GHS is discussed in detail for TE and TM polarized light. Significant increase in GHS is observed as the number of ENZ slabs in stratified structure is increased. When all the slabs have equal permittivity, published results for a single ENZ slab are recovered. The presented work will help in designing stratified ENZ medium with required GHS and reflectivity for optical sensors. Graphic abstract
      PubDate: 2022-05-12
       
  • A prospective study on ionization of endohedral metallofullerene as
           

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      Abstract: Since the discovery of endohedral metallofullerene, it has always been attractive among researchers in various fields of utilities. An encapsulated Au atom with fullerene can be an ideal active agent for enhancing the response of the ligand docking site of protein for cryo-electron microscopy. In this study, we have used high energy electron scattering to ionize encapsulated Au atom, which is docked in protein’s cavity. It is to identify the capabilities of encapsulated Au atom as a biomarker for cryo-electron microscopy. We have applied a fully relativistic calculation to calculate differential cross section and spin asymmetry with relativistic wave functions at the high impact energy. The obtained results reflect that endohedral metallofullerene can enhance the scattering amplitude of protein, which could be a biosensing tool for cryo-EM, as well as the study of drug docking with any protein molecule. Graphic
      PubDate: 2022-05-11
       
  • Dynamic behaviour of beta decay constant in H-like atoms with intense
           laser

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      Abstract: Beta decay in hydrogen-like atoms is studied under the influence of a linearly polarized laser field. The oscillating electronic cloud under an intense laser field produces a time-varying field around the nucleus. The interaction of this electric field with the nucleus of the hydrogenic system is studied in terms of interaction between the electronic and nuclear charge densities. The nuclear transition matrix for beta decay is calculated by considering the interaction Hamiltonian, and the variations in the decay constant are analyzed. Graphic
      PubDate: 2022-05-06
       
  • The role of dynamic absorption and polarization potentials in relativistic
           excitation of xenon

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      Abstract: Data on excitation of rare gases is mainly important in the study of lighting, plasma displays and lasers. From literature, cross sections data on electron impact excitation of low-lying resonance states of xenon atoms with both relativistic and non-relativistic computations often differ with available experimental data mostly at low and intermediate impact energies and at intermediate scattering angles. With this in view, we have applied relativistic effects in a fully relativistic distorted-wave born approximation approach to excitation of the lowest lying resonance states of a xenon target atom in a complex potential in order to solve the Dirac equations to obtain the free electron wavefunctions and corresponding excitation cross sections. Present differential cross sections (DCS) results from this study predict that absorption effects in the distortion potential generally have minimal effect on cross sections at impact energies below 50 eV, but then significantly improve these results in comparison with experiments as kinetic energy of the incident electron increases. Furthermore, it is evident that the energy dependent dynamic polarization potential adopted plays a major role in improving shapes of cross sections at low and near threshold impact energies, where other distorted-wave methods fail to give satisfactory results. Graphical abstract We have applied a fully relativistic distorted-wave (RDW) approach to inelastic excitation of the lowest J = 1 states of xenon in which a complex potential (SEPA = static (S), + exchange (SE), + polarization (SEP) and + absorption (SEPA)) is used to solve the Dirac equations to obtain electron initial and final wave functions \(\chi_{a}^{ + }\) and \(\chi_{b}^{ + }\) respectively). The transition matrix \(T_{a \to b}^{RDW} = \left\langle {\chi_{b}^{ - } \left {V - U} \right A\chi_{a}^{ + } } \right\rangle\) is then used to obtain the differential cross sections. Theoretical studies on excitation of xenon J  = 1 states [1–3] have not yet applied this approach. Experimental (Expt.) results are in bullets while calculations are in full and dotted lines. Present DCS results predict that the polarization potential plays a major role of improving cross sections at low and near excitation threshold while absorption does this above 50 eV.
      PubDate: 2022-05-06
       
  • Photofragmentation dynamics study of ArBr $$_2$$ 2 $$(v=16,\ldots ,25)$$ (
           v = 16 , … , 25 ) using two theoretical methods: trajectory surface
           hopping and quasiclassical trajectories

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      Abstract: The vibrational predissociation of van der Waals complexes has been the object of study using a wide range of theoretical and experimental methods, producing a large number of results. We focus here on the ArBr \(_2\) ( \(v=16,\ldots ,25\) ) system. For its study, we employ two important theoretical methods: the trajectory surface hopping (TSH) and the quasiclassical trajectory method (QCTM). In the first case, the dynamics of the system are reproduced on a potential energy surface (PES) corresponding to quantum molecular vibrational states. The possibility of hopping to other vibrational surfaces is also included, which can then lead to van der Waals bond dissociation. On the other hand, the second case consists of propagating the dynamics over a single potential energy surface. We incorporate the kinetic mechanism into the TSH method for better comparison of the evolution of the complex. Both methods allow us to study the dynamical behavior of the ArBr \(_2\) as well as several observables. We compute the lifetime, exit channel, rotational energy, and maximum angular momentum ( \(j_{max}\) ) of Br \(_2\) . We compare our results with previous experimental and theoretical work and also report new results for cases that have not previously been considered. Graphical abstract
      PubDate: 2022-05-06
       
  • Design and development of dielectric barrier discharge setup to form
           plasma-activated water and optimization of process parameters

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      Abstract: In the present work, a co-axial cylindrical plasma device has been designed and developed to generate dielectric barrier discharge to form plasma-activated water (PAW). The voltage–discharge current characteristics and optical emission spectroscopy are performed to characterize the plasma and identify the formed plasma species. The impact of process parameters on physicochemical properties of PAW and on the concentration of reactive oxygen–nitrogen species is studied using a design of experiment methodology. The obtained results are analyzed using analysis of variance, effect estimation, marginal means, and regression analysis. The optimum values of process parameters to form PAW are determined using MATLAB fmincon function. The obtained results show that plasma–water exposure time and plasma discharge power significantly influence the physicochemical properties of PAW and the concentration of NO3‾ and NO2‾ ions in plasma-activated water. Graphical abstract
      PubDate: 2022-05-05
       
  • On the temperature of large biomolecules in ion-storage rings

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      Abstract: A method to determine the temperature of molecular ions in an ion-storage ring is presented. Molecular ions were repeatedly irradiated by laser pulses over several hundred milliseconds, and the rate of fragmentation was used to determine the temperature of the photoexcited ions. The initial temperature of the ions before photoabsorption was in turn found from the microcanonical caloric curve for the molecule of interest. The temperature evolution of the protonated GFP chromophore in the ELISA storage ring was found for different starting conditions by this method. We find that the initial temperature of the ions when entering the ring depends on the ion-trap temperature and the amount of buffer gas used in the trap. In particular, collisional heating during acceleration after the ion trap can be significant. Protonated GFP chromophores, produced under different conditions, were used to determine temperature effects on the gas-phase absorption spectra. Graphical abstract
      PubDate: 2022-05-04
       
  • Attosecond coupled electron-nuclear dynamics of H $$_2$$ 2 molecule under
           intense laser fields

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      Abstract: Sequential double ionization and fragmentation dynamics of the H \(_2\) molecule exposed to an 750 nm, 4.5 fs elliptically polarized laser pulse is investigated by employing a quasi-classical model. In the model, momentum-dependent auxiliary potentials are added to the Hamiltonian to account for non-classical effects. Through theoretical exploitation of the molecular clock technique, the evolution of the vibrational wave packet of H \(_2^+\) formed by over-the-barrier ionization of the H \(_2\) molecule is tracked between the first and second ionization events with the temporal resolution of 140 attoseconds. The role of electron correlation in strong field ionization is captured. Our results show that the quasi-classical model is quite capable of describing and predicting light-induced multi-electron processes in the molecules. Our study provides a simple path of explaining and understanding the physical mechanism of the strong field multi-electron processes. Graphic abstract
      PubDate: 2022-05-03
       
  • Publisher Correction to: Theoretical calculations of the photoionization
           cross sections for the ground and lowest two excited states of Ni XVIII
           ion

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      PubDate: 2022-05-02
       
  • Structural physical approximation of partial transposition makes possible
           to distinguish SLOCC inequivalent classes of three-qubit system

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      Abstract: Detection and classification of entanglement properties of a multi-qubit system is a topic of great interest. This topic has been studied extensively, and thus we found different approaches for the detection and classification of multi-qubit entangled states. We have applied partial transposition operation on one of the qubits of the three-qubit system and then studied the entanglement properties of the three-qubit system, which is under investigation. Since the partial transposition operation is not a quantum operation, we have approximated partial transposition operation in such a way that it represents a completely positive map. The approximated partial transposition operation is also known as structural physical approximation of partial transposition (SPA-PT). We have studied in detail the application of SPA-PT on a three-qubit system and provided explicitly the matrix elements of the density matrix describing SPA-PT of a three-qubit system. Moreover, we propose a criterion to classify all possible stochastic local operations and classical communication inequivalent classes of a pure as well as mixed three-qubit state through SPA-PT map, which makes our criterion experimentally realizable. We have illustrated our criterion for detection and classification of three-qubit entangled states by considering few examples. Graphical
      PubDate: 2022-04-26
       
  • Non-relativistic bound state solutions with α-deformed Kratzer-type
           potential using the super-symmetric WKB method: application to
           theoretic-information measures

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      Abstract: In this work, we studied the bound states and quantum theoretic-information measurements of an \(\alpha\) -deformed Kratzer-type potential with the Schrodinger equation. The ground state wave function in position-momentum spaces and the energy spectra equations for arbitrary quantum numbers are obtained in closed-form via the super-symmetric WKB method and Fourier transform. The obtained energy equation is bounded and reduces to the molecular Kratzer-type energy and the hydrogenic Coulomb’s energy upon proper adjustment of potential parameters. The wave function was used to obtain the Fisher, Shannon, Rényi and Tsallis theoretic-information measures numerically. Our results for the information measures obey the local Fisher inequality and the Bialynicki-Birula–Mycielski inequality. The Rényi and Tsallis entropies in position-momentum spaces were obtained for the index number \(q = 0.5\) and \(q = 2\) as a function of the potential parameter. The results of the theoretic-information quantities and probability densities revealed that the potential parameters strongly influence the localization and delocalization of the position of a nano particle. Graphical abstract
      PubDate: 2022-04-24
       
  • Rabi oscillation and quantum decoherence of an optomechanical system with
           a three-level V-type atom trapped in a two-mode cavity

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      Abstract: In this paper, the Rabi oscillation of a three-level V-type atom trapped in a two-mode cavity field interacting with the phonon field is investigated by establishing a model in Hilbert space, and an analytical expression for the Rabi oscillation is given. We find that the Rabi oscillation is periodic or quasiperiodic by appropriately adjust the atom-cavity coupling strength or phonon-cavity coupling strength, therefore, the periodicity of the Rabi oscillation does not depend on the resonance between the cavity and the micromechanical oscillator. The modulation period of Rabi oscillation and the number of oscillations in each period are given, which are obviously different from JC model. Compared with the period of JC model, the period of our model is larger under the same conditions, which makes it easier to study when it is used as the output signal. At the same time, the period of our model is more adjustable experimentally, furthermore, the period of Rabi oscillation will change greatly even when the parameter change is very small(except the resonance between the cavity and the micromechanical oscillator), which is helpful to study the sensitivity of the system and can also be used for the study of information amplification. And the quasi period is completely caused by the phonon field, so the quasi-periodicity is helpful for us to study the role of the phonons in the system. Furthermore, we study the quantum decoherence effect of the phonon field and cavity field and give the decoherence time scale and a constraint of the system, then extend it to the case of multiple modes cavity field. Graphical abstract
      PubDate: 2022-04-21
       
  • Coherent manipulation of trapped Rb atoms by overlapping frequency-chirped
           laser pulses: theory and experiment

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      Abstract: We present results of experimental and theoretical studies of coherent momentum transfer to rubidium atoms in a magneto-optical trap by pairs of counter-propagating frequency-modulated (chirped) laser pulses. The counter-propagating pulse pairs partially overlap each other leading to multiphoton interaction processes. We show experimentally that the mechanical momentum transferred to atoms in this scheme of interaction is larger than in the case of non-overlapping pulse pairs acting separately on the atoms. Results of numerical simulations that take into account all relevant hyperfine energy states of Rb along with the influence of relaxation and re-pumping processes are in good agreement with obtained experimental results. Graphical abstract
      PubDate: 2022-04-20
       
 
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