Anomalous amplification of electromagnetic field in the course of the nonrelativistic electron scattering by ion in the moderate-strong light field

Abstract

The electromagnetic field amplification constant in the scattering of the nonrelativistic electrons by ions in the elliptically polarized light wave is theoretically studied for any intensities for which radiation amplification takes place. The anomalous amplification effect in the moderate-strong electromagnetic field is predicted. This effect results in to increase of the Bunkin-Fedorov quantum parameter up to quantities of order γi ∼ 103. The anomalous amplification effect is exhibited for linear polarization of a wave the most brightly.

Superradiation in the course of the electron scattering by Ions in a light field

“…The amplification (absorption) takes place when G > 0 (G < 0). It is important to emphasize that in article [6] the simple analytical formula for function G (24) has been obtained for weak (11) and medium (12) fields in generally elliptic polarization. Thus this function does not depend on the field intensity and is determined only by the wave polarization δ, an angle θ i (10) and parameter ε 1 (4):…”

“…In the Born approximation with respect to the electron interaction with the ion field (for relatively fast electrons with υ i /c Z/137, Z is the nuclear charge), the amplification of radiation was studied for the linear polarization in [2] and for the circular polarization in [3]- [5]. For the elliptical polarization, the problem was studied in [6].…”

Amplification of electromagnetic field in electron scattering by ions in a weak light field: general relativistic case

“…The analysis of the amplification of electromagnetic radiation in the course of electron scattering by ions in the presence of the field of a plane electromagnetic wave was started in [1] and has had a long history (see, for example, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and the monographs [17][18][19][20][21][22]). In the quasi-classical approximation with respect to the electron's interaction with the ion field (for relatively slow electrons with v i /c Z/137, where Z is the nuclear charge, v i is the electron velocity, and c is the velocity of light in vacuum), the problem was studied in [10][11][12][13]21].…”

“…Let us note that a simple analytical formula for the gain coefficient in the case of arbitrary elliptic polarization of the electromagnetic wave has been obtained in [15] for weak and medium fields. It is important to emphasize that in [16] an anomalous amplification effect of the electromagnetic radiation in the scattering of nonrelativistic electrons by ions in an elliptically polarized light wave for the moderately strong fields is theoretically predicted.…”

Resonant spontaneous bremsstrahlung by an electron scattered by a nucleus in the field of a pulsed light wave

“…We note that the influence of an external strong field on QED processes was also examined in Refs. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”