Geodesic
Collective two-photon processes in the presence of a~thermal electromagnetic field
Teoretičeskaâ i matematičeskaâ fizika, Tome 88 (1991) no. 3, pp. 416-429

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A study is made of a lumped system of emitters (nuclei, atoms, molecules) with dipole-forbidden transitions between the first two energy levels in interaction with a thermal electromagnetic field. Elimination of the boson operators leads to an equation for the statistical operator of the system of emitters describing two-photon interaction with the electromagnetic field. A Fokker–Planck equation is also obtained and solved in the stationary case, and the result is used to investigate the equilibrium fluctuations in the populations of the atomic levels. The kinetics of the system and the statistical properties of the electromagnetic field are considered. 
@article{TMF_1991_88_3_a6,
     author = {N. A. Enaki and O. B. Prepelitsa},
     title = {Collective two-photon processes in the presence of a~thermal electromagnetic field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {416--429},
     publisher = {mathdoc},
     volume = {88},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_88_3_a6/}
}
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N. A. Enaki; O. B. Prepelitsa. Collective two-photon processes in the presence of a~thermal electromagnetic field. Teoretičeskaâ i matematičeskaâ fizika, Tome 88 (1991) no. 3, pp. 416-429. http://geodesic.mathdoc.fr/item/TMF_1991_88_3_a6/