From Bloch model to the rate equations II: the case of almost degenerate energy levels [PDF]
Mathematical Models and Methods in Applied Sciences, 2004 Bloch equations give a quantum description of the coupling between an atom and a driving electric force. In this article, we address the asymptotics of these equations for high frequency electric fields, in a weakly coupled regime.
Alinhac S. +17 more
core +16 more sources
Coherent backscattering of intense light by cold atoms with degenerate energy levels: Diagrammatic treatment [PDF]
Physical Review A, 2014 We present a generalization of the diagrammatic pump-probe approach to coherent backscattering (CBS) of intense laser light for atoms with degenerate energy levels.
Blattmann, R. +3 more
core +7 more sources
Lamb shift of non-degenerate energy level systems placed between two infinite parallel conducting plates [PDF]
Journal of Physics A: Mathematical and Theoretical, 2012 The issue of the observability of the Lamb shift in systems with non-degenerate energy levels is put to question. To this end, we compute the Lamb shift of such systems in the electromagnetic environment provided by two infinite parallel conducting ...
Billaud, B., Truong, T. -T.
core +7 more sources
Spin–spin relaxation of nuclear quadrupole resonance coherences and the important role of degenerate energy levels [PDF]
Molecular Physics, 2020 We present an extension of a Redfield approach for calculating spin–spin relaxation rates of zero-field nuclear quadrupole resonance (NQR) coherences, which was published in [Kruk et al., PCCP, 201...
Christian Gösweiner +2 more
semanticscholar +4 more sources
Nonlinear propagation of polarized light pulses in a medium of atoms with degenerate energy levels: Adiabatic approach [PDF]
Physical Review A, 2013 12 pages, 4 ...
V. I. Yudin +3 more
semanticscholar +6 more sources
Photoionization of Electrons in Degenerate Energy Level of Hydrogen Atom Induced by Strong Laser Pulses [PDF]
Photonics, 2022 Photoionization dynamics of bounded electrons in the ground state, the first and second excited states of a hydrogen atom, triggered by ultrashort near-infrared laser pulses, have been investigated in a transition regime (γ∼1) that offers both multiphoton and tunneling features.
Peipei Xin +4 more
openalex +3 more sources
Calculation of quasi-degenerate energy levels of two-electron ions [PDF]
Physical Review A, 2003 Accurate QED calculations of the interelectron interaction corrections for the $(1s2p)2 {}^1 P_1$, $(1s2p)2 {}^3 P_1$ two-electron configurations for ions with nuclear charge numbers $10\le Z \le 92$ are performed within the line profile approach.
G. L. Klimchitskaya +24 more
core +2 more sources
Application of quasi-degenerate perturbation theory to the calculation of rotational energy levels of methane vibrational polyads [PDF]
The Journal of Chemical Physics, 2015 In previous works, we have introduced an alternative perturbation scheme to find approximate solutions of the spectral problem for the rotation-vibration molecular Hamiltonian. An important feature of our approach is that the zero order Hamiltonian is the direct product of a purely vibrational Hamiltonian with the identity on the rotational degrees of ...
Patrick Cassam-Chenaı̈ +4 more
openalex +6 more sources
Deformed Oscillators with Two Double (Pairwise) Degeneracies of Energy Levels [PDF]
Symmetry, Integrability and Geometry: Methods and Applications, 2007 A scheme is proposed which allows to obtain special $q$-oscillator models whose characteristic feature consists in possessing two differing pairs of degenerate energy levels.
Alexandre M. Gavrilik +1 more
doaj +5 more sources
Semiclassical spectral estimates for Schrödinger operators at a critical energy level. Case of a degenerate potential [PDF]
, 2004 15 pages, minor ...
Brice Camus
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