 Subjects -> ELECTRONICS (Total: 207 journals)
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- Tunable Rydberg–Rydberg transitions in helium with reduced sensitivity
to dc electric fields by two-colour microwave dressing-
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Authors: L L Brown; S D Hogan
First page: 205001
Abstract: The difference in the static electric dipole polarizabilities of the and Rydberg levels in helium has been eliminated by dressing the atom with a microwave field near resonant with the single-photon transition. For an amplitude dressing field, detuned by from the zero-field transition frequency, the dc Stark shift of the two-photon transition between these states remained within for electric fields up to . This transition was probed by single-color two-photon microwave spectroscopy, and by two-color two-photon spectroscopy with one strong additional dressing field and a weak probe field. For all measurements, the transition frequencies and Stark shifts were compared, and found to be in excellent quantitative agreement with the results of Floquet calculations of the energy-level structure of the Rydberg states in the presence of the dressing fields and applied dc electric fields. The two-color microwave dressing scheme demonstrated, with one field applied to null the differential polarizability of the Rydberg–Rydberg transition, and the second exploited to allow the two-photon transition to be employed to achieve tunable absorption of single-photons from a weak probe field, will facilitate improved coherence times and tunable single-photon absorption in hybrid cavity QED experiments with Rydberg atoms and superconducting microwave circuits.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-18T23:00:00Z
DOI: 10.1088/1361-6455/aceeda
Issue No: Vol. 56, No. 20 (2023)
- Study of the velocity-selection satellites present in the 5P3/2→6PJ
(
J=1/2, 3/2 ) electric quadrupole transitions in atomic rubidium
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Authors: F S Ponciano-Ojeda; C Mojica-Casique, L M Hoyos-Campo, F Ramírez-Martínez, J Flores-Mijangos J Jiménez-Mier
First page: 205002
Abstract: This article presents detailed experimental and theoretical studies of the satellite fluorescence lines observed when the , (, ) electric quadrupole transition (E2) is excited in a room temperature vapor of rubidium atoms. The initial state of this E2 transition is prepared by a narrow linewidth (9 MHz) laser locked to one of the dominant D2 hyperfine excitations for zero-velocity atoms. Effects due to the selection of different atomic velocity classes in this preparation step are responsible for the presence of several satellite lines that can be found in the fluorescence decay spectra of both 85Rb and 87Rb. Compared to the main lines, these satellites do not show a strong dependence on the relative linear polarization directions of the lasers used in the preparation and the electric quadrupole steps. The relative intensities of the satellites decrease as the intensity of the preparation laser increases. Results of a rate equation calculation that explicitly includes selection-of-velocity effects indicate that optical pumping plays a central role in determining the relative intensities and the polarization dependence of the satellite lines. When the preparation laser is locked to the low-F cyclic transition in 87Rb, six lines were found in addition to the lone electric quadrupole transition for zero velocity atoms. In this case, the calculated spectrum is necessary for the correct interpretation of the experimental results, clearly indicating that optical pumping and selection of velocities are responsible for these six additional electric quadrupole lines.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-20T23:00:00Z
DOI: 10.1088/1361-6455/acf821
Issue No: Vol. 56, No. 20 (2023)
- Vacuum UV studies of protonated serine clusters
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Authors: Ori Licht; Maria Nihamkin, Mirit Anaby, Patrick Rousseau, Alexandre Giuliani, Aleksandar R Milosavljević, Raj Singh, Vy T T Nguyen, Laurent Nahon Yoni Toker
First page: 205101
Abstract: In a recent work, we have shown that photon absorption can cause a chemical bond to be created between the two monomers within a protonated serine dimer, a process known as intra-cluster bond formation, despite this process not occurring following thermal excitation via low energy collision-induced dissociation (LE-CID). Here we show further evidence for non-statistical photon-induced dissociation (PID) of the protonated serine dimer. In addition we discuss LE-CID and PID studies of the protonated serine octamer, showing that in this case as well, PID leads to non-statistical fragmentation and to the formation of two bonds between three neighboring monomers.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-18T23:00:00Z
DOI: 10.1088/1361-6455/acf81f
Issue No: Vol. 56, No. 20 (2023)
- Potential energy curves of molecular nitrogen up to N
24+
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Authors: A Hadjipittas; A Emmanouilidou
First page: 205102
Abstract: The potential energy curves for molecular ions up to N are calculated in an ab initio manner using the multi configurational self-consistent field method. Specifically, we implement in an automatic way a previously used double loop optimisation scheme within the multi configurational self-consisted field method. We obtain the potential energy curves up to N ions with any combination of core, inner valence, and outer valence holes. Finally, we provide the code used to generate these potential energy curves.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-18T23:00:00Z
DOI: 10.1088/1361-6455/acf5b7
Issue No: Vol. 56, No. 20 (2023)
- Rotational wave packet of NO+ created upon strong-field ionization of NO
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Authors: Shinichi Fukahori; Hirokazu Hasegawa
First page: 205601
Abstract: We theoretically investigate the creation of the rotational wave packet in molecular ions upon the strong-field ionization of diatomic molecules by a femtosecond laser pulse. The rotational excitation of molecular cation is ascribed to the dependence of the strong-field ionization probability on the orientation angle of the molecular axis with respect to the laser polarization direction. By extending the molecular strong-field approximation theory, we calculate the rovibrational state distribution of the ground electronic X state of NO+ after the ionization of NO in the electronic ground X state. We also show that the extent of the rotational excitation of NO+ is enhanced by the stimulated impulsive Raman processes both in neutral NO and in NO+ cation. The resultant time evolution of the rotational wave packet of NO+ is in good agreement with the delay dependent NO2+ yield recorded experimentally in our previous pump–probe study.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-20T23:00:00Z
DOI: 10.1088/1361-6455/acf631
Issue No: Vol. 56, No. 20 (2023)
- Lowest-order relativistic interaction between lattice vibrations and
internal degrees of freedom of a nucleus-
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Authors: Peter L Hagelstein
First page: 195002
Abstract: A moving nucleus experiences a Lorentz contraction and spin rearrangement due to relativity. A nucleus that oscillates in a molecule or solid due to vibrations will undergo minor relativistic modifications which are a result of the vibrations, indicative of a relativistic phonon-nuclear interaction. The derivation of the lowest-order interaction from the many-particle Dirac model is reviewed. The Dirac model with a realistic potential model is not covariant, which is a source of concern. The lowest-order phonon-nuclear interaction obtained from a covariant two-body Bethe–Salpeter model is found to be similar to the interaction obtained from the Dirac model, supporting the notion that the interaction is not an artifact. Matrix elements of the lowest-order interaction are expressed in terms of one-body operators, which facilitates evaluation and allows for quantitative estimates of the magnitude.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-13T23:00:00Z
DOI: 10.1088/1361-6455/acf3be
Issue No: Vol. 56, No. 19 (2023)
- Molecular-frame photoelectron angular distributions during double
core-hole generation in O2 and N2 molecules-
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Authors: Dmitrii V Rezvan; Nikolay M Novikovskiy, Daniel M Haubenreißer, Boris M Lagutin Philipp V Demekhin
First page: 195003
Abstract: Angular distributions of photoelectrons emitted upon double core-hole (DCH) generation in nitrogen and oxygen molecules are studied theoretically in the frame of a molecular reference. The respective electronic structure calculations are performed by the single center method for photoelectron kinetic energies up to 40 eV in the relaxed-core Hartree–Fock approximation. The molecular frame photoelectron angular distributions are computed for single-site and two-site DCH creation processes and further analyzed for different orientations of the molecular axis with respect to the electric field vector of linearly polarized incident light and for localized or delocalized emitting atomic site scenarios. The present theoretical results provide reliable predictions for future experiments with high-repetition free-electron lasers.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-14T23:00:00Z
DOI: 10.1088/1361-6455/acf79c
Issue No: Vol. 56, No. 19 (2023)
- Quantum state engineering in a three-level system with periodical Gaussian
pulses-
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Authors: Cheng Yuan; Qiu-Yue Ran, Xiao-Qing Gao, Reuven Ianconescu, Ze-Long He Du Ran
First page: 195501
Abstract: In this paper, we propose a scheme to achieve selective population transfer in a Λ-type three-level atomic system with a train of periodical Gaussian pulses. Based on temporal constructive quantum interference between the sequential transitions and subsequent coherent accumulations, the selective population transfer can be achieved with the pulse train, without satisfying the requirement of two-photon resonance condition. It can be understood as a result of the formation of a comb-like structure of the pulse train spectrum in time domain. Numerical simulations demonstrate that the scheme is robust against the wave-form deformation of single pulse while sensitive to the pulse train repetition period. Due to the Gaussian waveform of the laser field been readily implemented in experiments, the scheme holds great practicality for quantum state engineering in quantum information processing.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-17T23:00:00Z
DOI: 10.1088/1361-6455/acf79b
Issue No: Vol. 56, No. 19 (2023)
- Controlling polarization of high-order harmonics generated in the mixed
gases with orthogonal two-color laser fields-
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Authors: Chunyang Zhai; Yinmeng Wu, Xiang Li, Ke Zhang, Shuaijie Kang, Zhengfa Li, Fengyan Guo, Yingbin Li, Qingbin Tang Benhai Yu
First page: 195601
Abstract: The generation of highly elliptically polarized high-order harmonics (EPHHs) is indispensable for investigating chirality-sensitive light-matter interactions. Recently, high-order harmonic generation (HHG) with controllable ellipticity and helicity has attracted considerable attention. In this work, we theoretically demonstrate the possibility of generating broadband EPHHs with the same helicity from mixed gases in orthogonal two-color fields. There is a specific relative phase between the HHG from different gas components of the mixture. In addition, manipulation of the phase difference can be achieved by controlling the alignment angle of the molecule in mixed gases. It enables us to selectively enhance one helicity component of the high-order harmonics in a wide spectral range. This scheme paves a way for possibly generating elliptically polarized attosecond pulses.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-11T23:00:00Z
DOI: 10.1088/1361-6455/acf630
Issue No: Vol. 56, No. 19 (2023)
- Elliptical high-order harmonic generation from current-carrying orbitals
of prealigned molecules-
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Authors: Kaiyi Wang; Yulin Ding, Feng Wang, Xiaofan Zhang Qing Liao
First page: 195602
Abstract: The polarization of high harmonics generated from current-carrying state of nitric oxide molecules irradiated by linear laser fields is investigated by numerically solving the three-dimensional time-dependent Schrödinger equation. It is found that the ellipticity of high harmonics is obviously dependent on the polar angle between the driving laser polarization and molecular axis which is interpreted by the strong field approximation model. Moreover, our results also show that the helicity of near-threshold harmonics is opposite to that of plateau harmonics when the molecule is at any polar angle. To analyze this phenomenon, we simulate the dipole matrix element numerically. Finally, the attosecond pulses with opposite helicities can be obtained by synthesizing near-threshold and plateau harmonics. The ellipticity can be tuned by the alignment angle of molecules. Our work may provide a theoretical guiding and detection tool for the electron dynamics of molecular current-carrying states.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-09-11T23:00:00Z
DOI: 10.1088/1361-6455/acf632
Issue No: Vol. 56, No. 19 (2023)
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