title: Microscopic nonlinear relativistic quantum theory of absorption of powerful x-ray radiation in plasma.
abstract: The microscopic quantum theory of plasma nonlinear interaction with the coherent shortwave electromagnetic radiation of arbitrary intensity is developed. The Liouville-von Neumann equation for the density matrix is solved analytically considering a wave field exactly and a scattering potential of plasma ions as a perturbation. With the help of this solution we calculate the nonlinear inverse-bremsstrahlung absorption rate for a grand canonical ensemble of electrons. The latter is studied in Maxwellian, as well as in degenerate quantum plasma for x-ray lasers at superhigh intensities and it is shown that one can achieve the efficient absorption coefficient in these cases.
authors.affiliation: Centre of Strong Fields Physics, Yerevan State University, 1 A. Manukian, Yerevan 0025, Armenia.
authors.forename: H K
authors.initials: HK
authors.lastname: Avetissian
authors.affiliation: Centre of Strong Fields Physics, Yerevan State University, 1 A. Manukian, Yerevan 0025, Armenia.
authors.forename: A G
authors.initials: AG
authors.lastname: Ghazaryan
authors.affiliation: Plasma Theory Group, Institute of Radiophysics and Electronics, NAS RA, 0203 Ashtarak, Armenia.
authors.forename: H H
authors.initials: HH
authors.lastname: Matevosyan
authors.affiliation: Centre of Strong Fields Physics, Yerevan State University, 1 A. Manukian, Yerevan 0025, Armenia.
authors.forename: G F
authors.initials: GF
authors.lastname: Mkrtchian