Results 221 to 230 of about 19,779 (264)
Some of the next articles are maybe not open access.
Photon Echoes and Degeneration of the Resonant Energy Levels
Spectroscopy Letters, 1974Abstract The influence of the degeneration of the resonant energy levels on the photon echo intensity is investigated.
L. A. Nefediev +2 more
openaire +1 more source
Adiabatic Theorem Violation for Degenerate Energy Levels
Physica Scripta, 1999For the exactly solvable model of a two-mode oscillator with slowly varying frequency of one of the modes it is demonstrated that such a quantum number as the angular momentum of the oscillator is not conserved in the adiabatic limit.
V I Man'ko, T Seligman
openaire +1 more source
Physical Review E, 2001
The behavior of quantum states and observables of a quasi-integrable quantum system is studied. Sensitivity of the quantum states and nonperiodicity of the average value of observables at the degenerate points of energy levels are observed. The behavior demonstrates the quantum properties corresponding to the classical resonant tori with rational ...
Y, Jin, K, He
openaire +2 more sources
The behavior of quantum states and observables of a quasi-integrable quantum system is studied. Sensitivity of the quantum states and nonperiodicity of the average value of observables at the degenerate points of energy levels are observed. The behavior demonstrates the quantum properties corresponding to the classical resonant tori with rational ...
Y, Jin, K, He
openaire +2 more sources
Chemical Physics Letters, 1978
Time-ordered folded diagrams are used to represent the effective hamiltonian in the adiabatic formalism. Resummation of the diagrams is shown to give a term-by-term correspondence with time-independent perturbation ...
Michels, M.A.J., Suttorp, L.G.
openaire +3 more sources
Time-ordered folded diagrams are used to represent the effective hamiltonian in the adiabatic formalism. Resummation of the diagrams is shown to give a term-by-term correspondence with time-independent perturbation ...
Michels, M.A.J., Suttorp, L.G.
openaire +3 more sources
The Journal of Chemical Physics, 1999
The physics of the degenerate four-wave mixing process for resonant transitions between two degenerate energy levels is investigated by direct numerical integration of the time-dependent density matrix equations. The Zeeman structure of the upper and lower energy levels is included in a multistate formulation of the density matrix equations.
Thomas A. Reichardt, Robert P. Lucht
openaire +1 more source
The physics of the degenerate four-wave mixing process for resonant transitions between two degenerate energy levels is investigated by direct numerical integration of the time-dependent density matrix equations. The Zeeman structure of the upper and lower energy levels is included in a multistate formulation of the density matrix equations.
Thomas A. Reichardt, Robert P. Lucht
openaire +1 more source
Kinetic theory of light-induced drift of particles with degenerate energy levels
Journal of Physics A: Mathematical and General, 1986The theory of light-induced drift of particles with degenerate levels is proposed. Kinetic equations which are semiclassical with respect to rotational degrees of freedom and with a phase memory accounting are obtained. The drift velocity dependence on radiation polarisation is predicted. Numerical calculation, which has been made in a strong collision
F Kh Gel'mukhanov +2 more
openaire +1 more source
ACS Applied Materials & Interfaces, 2021
Two-dimensional organic-inorganic lead halide perovskites are generating great interest due to their optoelectronic characteristics such as high solar energy conversion efficiency and a tunable direct band gap in the visible regime. However, the presence of defect states within the two-dimensional crystal structure can affect these properties ...
Brian A. Ko +7 more
openaire +2 more sources
Two-dimensional organic-inorganic lead halide perovskites are generating great interest due to their optoelectronic characteristics such as high solar energy conversion efficiency and a tunable direct band gap in the visible regime. However, the presence of defect states within the two-dimensional crystal structure can affect these properties ...
Brian A. Ko +7 more
openaire +2 more sources
The effect of quantum noise on the energy degeneration in a dissipative quantum two-level system
Chemical Physics Letters, 2001Abstract The influence of noise on the energy degeneration in a periodically driven two-state system is discussed. It is shown that the degenerate energy level of the system, split by an external monochromatic field, can be restored to the degenerate state by appropriate noise.
Jiqian Zhang, Houwen Xin
openaire +1 more source
Energy, 2021
Abstract Thermochemical cycle is a promising way for hydrogen production. Although the Gibbs free energy function has been used to assess thermochemical cycle reactions, it is difficult to explain exergy transfer and degeneration. There is no universal principle to explain the mechanism of triggering an endothermic reaction from the viewpoint of ...
Fan Jiao, Buchu Lu, Chen Chen, Qibin Liu
openaire +1 more source
Abstract Thermochemical cycle is a promising way for hydrogen production. Although the Gibbs free energy function has been used to assess thermochemical cycle reactions, it is difficult to explain exergy transfer and degeneration. There is no universal principle to explain the mechanism of triggering an endothermic reaction from the viewpoint of ...
Fan Jiao, Buchu Lu, Chen Chen, Qibin Liu
openaire +1 more source
The Journal of Chemical Physics, 1949
Formulas are given for an approximation to the energy values of the levels of the asymmetric rotor when the latter are essentially twofold degenerate. The method of arriving at these formulas follows that described recently, in which the energy matrix is examined under conditions where J→∞.
S. Golden, J. K. Bragg
openaire +1 more source
Formulas are given for an approximation to the energy values of the levels of the asymmetric rotor when the latter are essentially twofold degenerate. The method of arriving at these formulas follows that described recently, in which the energy matrix is examined under conditions where J→∞.
S. Golden, J. K. Bragg
openaire +1 more source