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 Showing 1 - 50 of 50 Journals sorted alphabetically Advances in Optics and Photonics       (Followers: 18) Annual Review of Nuclear and Particle Science       (Followers: 1) APL Photonics Atomic Data and Nuclear Data Tables EPJ A - Hadrons and Nuclei EPJ B - Condensed Matter and Complex Systems       (Followers: 1) EPJ E - Soft Matter and Biological Physics       (Followers: 3) EPJ Nuclear Sciences & Technologies       (Followers: 3) EPL Europhysics Letters       (Followers: 8) Fusion Science and Technology       (Followers: 4) IEEE Nanotechnology Express       (Followers: 18) International Journal of Quantum Chemistry       (Followers: 5) Journal of Nanomedicine & Nanotechnology       (Followers: 2) Journal of Nuclear and Particle Physics       (Followers: 14) Journal of Nuclear Materials       (Followers: 12) Journal of Physics G : Nuclear and Particle Physics       (Followers: 16) Journal of Quantum Chemistry       (Followers: 1) Kerntechnik Nano Energy       (Followers: 11) NanoImpact Nanotechnology Development       (Followers: 21) Nanotechnology, Science and Applications       (Followers: 7) Nuclear and Particle Physics Proceedings       (Followers: 3) Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment       (Followers: 18) Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms       (Followers: 17) Nuclear Materials and Energy       (Followers: 1) Nuclear Physics A       (Followers: 5) Nuclear Physics B       (Followers: 3) Nuclear Physics News       (Followers: 2) Nuclear Science and Engineering       (Followers: 7) Nuclear Technology       (Followers: 5) Nukleonika Particles Physica E: Low-dimensional Systems and Nanostructures       (Followers: 1) Physica Medica       (Followers: 4) Physical Biology       (Followers: 4) Physical Review A       (Followers: 24) Physical Review Accelerators and Beams       (Followers: 4) Physical Review B       (Followers: 32) Physical Review D       (Followers: 13) Physical Review E       (Followers: 42) Physical Review Letters       (Followers: 163) Physics of Atomic Nuclei       (Followers: 10) Physics of Particles and Nuclei       (Followers: 2) Physics of Particles and Nuclei Letters       (Followers: 1) Progress in Particle and Nuclear Physics       (Followers: 2) Radiation Detection Technology and Methods       (Followers: 1) The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics       (Followers: 29) The European Physical Journal Special Topics       (Followers: 1) World Journal of Nuclear Science and Technology       (Followers: 4)
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 The European Physical Journal D - Atomic, Molecular, Optical and Plasma PhysicsJournal Prestige (SJR): 0.387 Citation Impact (citeScore): 1Number of Followers: 29      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1434-6060 - ISSN (Online) 1434-6079 Published by Springer-Verlag  [2467 journals]
• Harmonics generated in circularly polarized laser fields: a study on spin
angular momentum conservation

Abstract: Harmonics generated from the electronic transition among continuum states are studied by a quantum scattering theory. The analytical formulas of the harmonics generated in one- and two-color circularly polarized (CP) laser fields are obtained rigorously. The harmonic generation amplitude is described by a pair of phased generalized Bessel functions, by which the conservation relations of the spin angular momentum are derived in a solid base and in a straightforward way. It is found that, owing to the spin angular momentum conservation, high-order harmonics cannot be generated in the one-color CP fields, but can be generated in the bichromatic CP fields. To a given harmonic order, two generation channels exist: one generates right CP harmonic, while the other generates left CP harmonic. When the driving CP modes are of opposite helicity, the generated right CP harmonic is of the comparable strength to the left CP harmonic. When the driving CP modes are of same helicity, the harmonic with the same helicity as the driving fields is much stronger than that with the opposite helicity to the driving fields. The selection rules of harmonics are different in these two kinds of bichromatic CP driving fields. Graphic Figure depicts the calculated harmonic spectra generated from Ar atoms. For the counter-rotating driving fields, the harmonic spectra exhibit clear plateau and sharp cutoff structures, for both the right and left CP harmonics. The right CP harmonics are of 3n-1 series in order, while the left CP harmonics are of 3n+1 series in order. Generally, the right CP harmonics are stronger than the adjacent left CP harmonics. For the co-rotating driving fields, the harmonic rate decreases fast as the harmonic order increases, thus the plateau and the cutoff structures are not clear as their counterparts in the previous case, for both right CP and left CP harmonics. The harmonic spectra change continuously in order. Each harmonic order has its right CP and left CP components, but generally, the left CP components are much smaller than the right CP components. It is also clear that the harmonics generated from counter-rotating BCP fields are much stronger than that generated from co-rotating BCP fields.
PubDate: 2023-01-27

• The influence of the structure of atomic systems on the dynamics of
electron exchange in ion–ion collision

Abstract: One electron exchange between the Rydberg states of ions is elaborated within the time-symmetrized framework of two-wave-function model. It was observed that in an atomic collision, the population of ionic states by electron exchange, is strongly conditioned by the structure of the subsystem itself, especially at intermediate velocities. This circumstance is particularly pronounced when determining the ion–ion distances at which the charge exchange is most likely. The specificity of the model is reflected in the fact that the determination of the electron capture distance is carried out at fixed initial and final states of the system under consideration. As an illustrative example, XeVIII was used as a target of collision process, i.e. ion Xe $$^{8+}$$ initially populated in Rydberg state $$\nu _B=(n_B=8,l_B=0,m_B=0)$$ , while argon ions Ar $$^{Z_A+}$$ were used as projectiles in the core charge range $$Z_A\in [3,9]$$ . Graphic
PubDate: 2023-01-25

• Dominant Lyapunov mapping in phase and parameters spaces corresponding to
the thermodynamic limit of the two-mode Bose–Hubbard model applied to
the control of collapses of Josephson oscillations

Abstract: In this work, we propose the mapping of the phase space and parameters space of a classical counterpart of a system of spinless interacting bosonic particles trapped in a double-well potential submitted to a temporal modulation of on-site atom–atom interaction. To do this, we present a mapping of the dominant Lyapunov exponent of the equations of motion governed by the classical Hamiltonian corresponding to the thermodynamic limit of the two-mode Bose–Hubbard model. Such a proposal can be used to determine parameter ranges and regions of atomic coherent states that are amenable to undergo the control of collapses of Josephson oscillations. Our findings suggest that states and parameters associated with regular regime in the classical domain are amenable to this control be applied, whereas states settled in chaotic regions are not eligible. Graphic abstract
PubDate: 2023-01-25

• Atomistic modeling of thermal effects in focused electron beam-induced
deposition of Me $$_2$$ Au(tfac)

Abstract: The role of thermal effects in the focused electron beam-induced deposition (FEBID) of Me $$_2$$ Au(tfac) is studied by means of irradiation-driven molecular dynamics simulations. The FEBID of Me $$_2$$ Au(tfac), a commonly used precursor molecule for the fabrication of gold-containing nanostructures, is simulated at different temperatures in the range of $$300-450$$  K. The deposit’s structure, morphology, growth rate, and elemental composition at different temperatures are analyzed. The fragmentation cross section for Me $$_2$$ Au(tfac) is evaluated on the basis of the cross sections for structurally similar molecules. Different fragmentation channels involving the dissociative ionization (DI) and dissociative electron attachment (DEA) mechanisms are considered. The conducted simulations of FEBID confirm experimental observations that deposits consist of small gold clusters embedded into a carbon-rich organic matrix. The simulation results indicate that accounting for both DEA- and DI-induced fragmentation of all the covalent bonds in Me $$_2$$ Au(tfac) and increasing the amount of energy transferred to the system upon fragmentation increase the concentration of gold in the deposit. The simulations predict an increase in Au:C ratio in the deposit from 0.18 to 0.32 upon the temperature increase from 300 to 450 K, being within the range of experimentally reported values. Graphic
PubDate: 2023-01-25

• Fragmentation of tyrosine by high-energy electron impact

Abstract: The experimental mass spectra of the tyrosine molecule measured at different microtron accelerator-induced high-energy electron irradiation doses (i.e., 0, 5, and 20 kGy) have been identified and analyzed. The experimental investigation was carried out along with the theoretical study performed by Becke’s three-parameter hybrid density functional approach without and with the inclusion of electric and magnetic fields. It has been shown that high-energy (11.5 MeV) electrons cause irreversible changes in the structure and energy parameters of the molecule under study. The study revealed the importance of proton transfer for fragment formation of the irradiated and non-irradiated tyrosine. Graphic abstract
PubDate: 2023-01-20

• Alain, Claude et Franck

Abstract: Résumé Les auteurs évoquent les conditions dans lesquelles ils ont rencontré Alain Aspect et leur échanges fructueux avec lui avant, durant, et après sa thèse à l’Institut d’Optique. Alain est ensuite venu rejoindre le laboratoire Kastler Brossel à l’ENS pour plusieurs années. Les auteurs décrivent comment la convergence d’intérêts sur de nombreux points de physique a conduit à une collaboration très fructueuse, au cours de laquelle Alain a obtenu des résultats particulièrement intéressants. Cette collaboration a permis de développer une solide amitié.
PubDate: 2023-01-17

• Correction to: Reply to comment on “New apparatus design for high
precision measurement of $$G$$ with atom interferometry”

PubDate: 2023-01-16

• Density functional studies of probucol excited states and spectral
properties

Abstract: Probucol (PB) is a lipid-regulating agent with powerful antioxidant, anti-inflammatory and anti-atherogenic effects. In this paper, based on density functional theory (DFT), B3LYP/def2tzvp functional and basis set are used to optimize the structure of PB molecule, and the vibration attribution analysis is carried out. On the basis of optimization, the first 40 excited states of molecule in anhydrous ethanol were calculated by time-density functional theory (TD-DFT). Then UV spectrum and electron–hole diagrams are drawn to analyze the excited state properties. Finally, the antioxidant mechanism of PB was theoretically analyzed by predicting the active site of PB molecule. This study has two purposes: first, to verify the experimental spectra, and second, to provide basic data for the properties of PB molecule, and provide theoretical reference for its antioxidant mechanism in clinical medicine, as well as antioxidant detection in food and care products. Graphic abstract
PubDate: 2023-01-12

• Field emission in an array of homogeneous identical nanometer-long
nanotubes

Abstract: Abstract We consider the problem of field emission based on carbon nanotubes. The length of these nanotubes differs from several nanometers to several hundreds of nanometers. We obtain the particle transmission function, considering the difference of potentials on the ends of nanotubes to be $$U = 2 \div 3.5{\text{ V}}$$ . Basing on the transmission function we calculate emission current. We establish the dependence of the Nordheim function on the length of nanotubes. The limiting transition is considered for the transmission coefficient for field emission from the cathode surface in the absence of nanotubes on it. We establish the linear dependence of current I on the field strength W and the linear dependence of function $$I/W^{2}$$ on the inverse value of field strength 1/W. Qualitative matching to experimental results of emission current is obtained when the voltage was kept less than the threshold value of 260 V and the distance between cathode and anode was kept constant, $$\approx 5 {\text{mm}}$$ .
PubDate: 2023-01-11

• Experimental tests of Bell’s inequalities: a first-hand account by
Alain Aspect

Abstract: Abstract On October 04, 2022, the Royal Swedish Academy of Sciences announced that the Nobel Prize for Physics of 2022 was awarded jointly to Alain Aspect, John Clauser, and Anton Zeilinger “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science.” What follows is an interview of Alain Aspect, conducted by Bill Phillips and Jean Dalibard, during the summer of 2022, and completed not long before the announcement of the Nobel Prize. The subject matter is essentially that for which the Nobel Prize was awarded.
PubDate: 2023-01-09

• Effect of quantum plasma on 2p photoionization cross section of
$$\textrm{Al}^{+3}$$ ion embedded in shock compressed aluminium

Abstract: We studied the effect of plasma environment on the valence shell (2p) photoionization cross section of $$\textrm{Al}^{+3}$$ ions which are the most abundant charge species in shock compressed Al plasmas. The thermodynamic conditions achieved in these plasmas generally correspond to warm dense regime. The effect of plasma density and temperature on the atomic potential in warm dense regime can be modelled via short range quantum plasma (QP) potential. We employed QP potential to study photoionization cross section from 2p subshell of $$\textrm{Al}^{+3}$$ ions by solving the radial Schrodinger equation within the one-electron model potential framework. Bound and continuum states of the ion were altered in the presence of plasma environment, and consequently, significant changes in the photoionization cross section were observed. It was observed that near the ionization threshold, low energy scattering became dominant and lead to drastic reduction in the cross section satisfying Wigner threshold law. This is a general feature exhibited for any value of screening strength ( $$\kappa$$ ) of the plasma. However, in the vicinity of critical screening strength ( $$\kappa _\textrm{c}$$ ), we observed resonance features at low photo electron energies. For $$\kappa >\kappa _\textrm{c}$$ , shape of the potential allowed formation of quasi-bound states which were responsible for trapping the photoelectron for a relatively longer time resulting in enhancement of the cross section termed ’shape resonance’. For $$\kappa <\kappa _\textrm{c}$$ , broad resonances, termed s-wave resonances, were observed. These resonances appear when near-zero energy photoelectrons get trapped in the bound s states which are on the verge of being pressure ionized. Graphic abstract
PubDate: 2023-01-07

• Quantum optics of light and matter: honouring Alain Aspect

Abstract: Abstract The topical issue “Quantum Optics of Light and Matter: Honouring Alain Aspect” encompasses a set of historical and personal perspectives on Alain’s career, and a series of scientific articles on contemporary research in quantum and atom optics. These contributions celebrate the amazing scientific career of Alain Aspect and provide fascinating perspectives for quantum information science and quantum technologies. It is a wonderful conjunction of events that this topical issue appears only a few weeks after Alain, together with John Clauser and Anton Zeilinger, was awarded the 2022 Nobel Prize in Physics.
PubDate: 2023-01-04

• Relative importance of the electron continuum intermediate state in
single-electron capture into any state of fast protons from helium-like
atomic systems

Abstract: Single-electron capture by fast protons from helium-like atomic targets is investigated at intermediate and high impact energies. The main purpose of the present study is a comprehensive analysis of the relative importance of the electron continuum intermediate state (ionization continua), with respect to direct transfer. To achieve this goal, first- and second-order theories are employed, and their results are thoroughly compared. The prior form of the boundary-corrected continuum intermediate state method (BCIS) is utilized, in both its three-body and four-body formulation, in addition to the four-body boundary-corrected first-Born approximation (CB1-4B), in both its prior and post form. BCIS methods belong to the class of second-order theories, while CB1 methods belong to the class of first-order theories. Relative importance of ionization continua is examined in the example of single-electron capture in collisions of fast protons with ground-state atomic helium. Both differential and total cross sections are analyzed, for single-electron capture into any final state of the projectile. The presented cross sections, aside from their fundamental importance, are relevant in various interdisciplinary applications, such as in astrophysics, thermonuclear fusion and plasma physics, and medical physics. Graphic
PubDate: 2023-01-04

• On the use of Ar I 517.753 nm spectral line for electric field
measurements in the cathode sheath of a Grimm-type glow discharge source

Abstract: We present the results of the optical emission spectroscopy study of the Ar I 517.753 nm spectral line, observed at different positions in the cathode sheath of an abnormal DC Grimm-type glow discharge source operated in argon. The line profiles were recorded parallel to the cathode surface (side-on view), along the discharge axis from the cathode towards the negative glow. The spectra show a red line shift, which diminishes with the distance from the cathode surface and decreasing electric field. This allows experimental determination of the coefficient C in quadratic relation, Δν = CE2, between the wavenumber Stark shifts, Δν, and electric field strength, E. The above relation is a low-field (up to 25 kV/cm) approximation of the quadratic dependence of the upper-level shift, measured for a large set of argon lines at high electric fields (up to 700 kV/cm) by Windholz (Phys Scr 21:67–74, 1980). One of these lines, Ar I 537.349 nm, is used here for independent measurement of the electric field E and correlated with the Ar I 517.753 nm upper-level wavenumber shift Δν to obtain a line-specific coefficient C. In this way, the Ar I 517.753 nm spectral line complements the set of argon lines suitable for Stark spectroscopy diagnostics of the electric field distribution and cathode sheath length, the knowledge of which allows for a better understanding and description of the glow discharge processes through various theoretical models. Graphical abstract Stark-shifted Ar I 517.753 nm line in the cathode sheath of the Grimm-type GDS, and the unshifted line emitted from the zero-field region
PubDate: 2023-01-04

• Critical velocities for the nanostructure creation on a metal surface by
an impact of slow highly charged Ar $$^{q+}$$ , Kr $$^{q+}$$ , and Xe
$$^{q+}$$ ions

Abstract: We study the interaction of highly charged ions (Ar $$^{q+}$$ , Kr $$^{q+}$$ , and Xe $$^{q+}$$ , charge $$q\gg 1$$ ) with metal surfaces for low to moderate ionic velocities. We calculate the neutralization energy and the deposited kinetic energy, both necessary for the nanostructure (hillocks or craters) creation. The cascade neutralization above the surface we analyze within the framework of the time-symmetrized two-state vector model and the micro-staircase model. The energy deposition inside the solid (nuclear stopping power) we consider using the charge dependent ion-target atom interaction potential. We define the critical ionic velocities as a measure of the interplay of the neutralization energy and the deposited kinetic energy in the process of the surface modification. These quantities enable us to distinguish the velocity regions characteristic for the particular nanostructure shapes. Graphical abstract
PubDate: 2023-01-04

• Computational approaches to examine the vacuum polarization density

Abstract: Abstract Based on computational quantum field theory and solutions to the Dirac equation, we show how the vacuum’s polarization density induced by strong external field can be calculated based on five independent methods. We compare these methods for a spatially reduced dimensional system and show that some approaches rely on energy renormalizations, energy cutoffs or periodic boundaries. We also illustrate the spatial implications of the breakdown of the linear superposition principle for extremely high intensity fields. A main focus of the article is to discuss future challenges for each approach that might motivate new theoretical and computational studies.
PubDate: 2023-01-04

• Effect of reactant’s rotational excitation on stereodynamic properties
of C + SH( $$v = 0, j =0{-}40$$ ) → H + CS reaction
investigated with quasi-classical trajectory method

Abstract: Rotational excitation of reactant is an important factor in chemical reaction dynamics. In this work, the quasi-classical trajectory method is applied to investigate the rotational excitation effects of collision reaction C + SH(v = 0, j = 0–40) → H + CS on potential energy surface of an excited electronic state A2A″ of HCS. The results suggest that rotational excitation effects of the total integral cross section are mainly observed in higher rotational states of j > 20. Rotational excitation of reactant can lead to ro-vibrational excitation of product. Moreover, rotational angular momentum vector of product is aligned along the direction at a right angle relative to the collision direction of reactants, but the alignment is not sensitive to rotational excitation of reactant. The distribution of P(ϕr) shows that the collision energy and rotational excitation of reactant have influence on the orientation of rotational angular momentum of product. In summary, rotational excitation of reactant obviously influences on scalar properties and stereodynamic properties of the reaction C + SH(v = 0, j = 0–40) → H + CS. Graphic The distributions P(ϕr) of the product molecule for the reaction C + SH(v = 0, j = 0–40) → H + CS(v′, j′) at different collision energies (0.10, 0.40, 0.80 eV)
PubDate: 2023-01-02

• Assessing slowdown times due to blackbody friction forces for
high-precision experiments

Abstract: We probe roles of blackbody friction forces (BBFFs) in slowing down alkali atoms, from Li through Fr, for high-precision measurements. An atom can encounter BBFF caused by the blackbody. We probe roles of blackbody friction radiations of the stray electromagnetic fields present in experimental set-up and other metallic shielding during measurements. Strengths of BBFFs on the alkali atoms are estimated by integrating complex parts of dynamic polarizabilities of atoms over a wide range of frequency. Slowdown times of moving atoms due to these friction forces are analysed as a function of temperature. The results are determined by both including and excluding nonresonant contributions in the polarizabilities of atomic states. This shows that inclusion of nonresonant contributions affects the slowdown time of atoms significantly at low temperatures. Our study will be useful in accounting for these slowdown times in the ongoing and future high-precision experiments involving alkali atoms. Graphic
PubDate: 2022-12-26

• Hydroxylated buckminsterfullerene complexes with endohedral europium atom

Abstract: The Eu@C60(OH)30 and Eu@C60(OH)20 endo-structures were predicted by the (U)DFT quantum chemical method. The arrangement of hydroxyl groups corresponds to the arrangement of chlorine atoms in (D3d)-C60Cl30 and fluorine atoms in (D5d)-C60F20. The calculated squares of the electron spin ‹Ŝ2› were reproduced with high accuracy by the addition of the spins belonging to two unpaired valence electrons and 4f7 subsystem. The total spin multiplicity of the quasi-degenerate ground state is 2·2·8. Some of its 32 components can be distinguished by the IR spectrum. The europium avoids benzoid cycles. It is located asymmetrically within the [18]trannulene cycle in the Eu@C60(OH)30 complex and between a peripheral carbon atoms of the corannulene fragments in the Eu@C60(OH)20 complex. The value ‹Ŝ2› ≈ 16.75 a. u., calculated with MS = 7/2, is key number. It allows limiting the DFT study to only one spin component out of 32 possible components. In contrast with Eu@C60(OH)30 and Eu@C60(OH)20, the Eu@C60 has two quasi-degenerate endohedral spin-tautomers. The (C3v) tautomer includes the hexagonal pyramid EuC6 formed as a result of endohedral η6-bonding of the europium with cyclohexa-1,3,5-triene fragment of buckminsterfullerene. It was obtained for the low-spin and high-spin components of the quasi-degenerate state with the total multiplicity 3·8. The (C2v) tautomer includes a triangular EuC2 fragment and was obtained for the octet spin state. The energy difference of the spin-tautomers is small, but the difference in its IR spectra is very large. Graphical The hydroxylated endohedral complexes
PubDate: 2022-12-26

• Correction: The Hong–Ou–Mandel experiment: from photon
indistinguishability to continuous-variable quantum computing

PubDate: 2022-12-22

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