Geodesic
Quasistationary quasi-energy states and convergence of perturbation series in a monochromatic field
Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 3, pp. 385-395 Cet article a éte moissonné depuis la source Math-Net.Ru

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To investigate the decay of a quantum system under the influence of an alternating external field, we develop a method of quasistationary quasi-energy states, whose complex quasi-energies and wave functions are obtained as the poles and residues of the wave functions of quasi-energy states of the continuum in the complex plane of the energy, The various forms of expression and the analytic properties of the integral equations for the quasistationary quasi-energy states are investigated. On the basis of an exact solution to a model problem and the general equations for the quasistationary quasi-energy states it is established that the perturbation series for the complex quasi-energy converge, and simple estimates are obtained for the radius of convergence. 
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N. L. Manakov; A. G. Fainshtein. Quasistationary quasi-energy states and convergence of perturbation series in a monochromatic field. Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 3, pp. 385-395. http://geodesic.mathdoc.fr/item/TMF_1981_48_3_a9/

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