Free electron transitions and light amplification

A new mechanism of light amplification on free-free electron transitions is considered, and light amplification is shown to be considerable. The amplification coefficient is calculated.     

About the disparity between differential cross sections of electron and positron bremsstrahlung

The electron and positron bremsstrahlung is considered for scattering on a hydrogen atom. It is shown that a successive consideration of the atomic electron role, even in the first Born approximation, gives rise to significantly different differential cross sections of electron and positron bremsstrahlung.     

Stimulation of beta-decay by laser radiation

This paper deals with the study of new beta-decay acceleration mechanisms. Estimations have proved that there is a real possibility for stimulated beta-decay detection. The required laser intensity has been achieved by now. The mechanism under discussion may be characterized as the opposite process of K-electron capture. This paper makes an essential distinction between the above-mentioned mechanism and other beta-decay acceleration mechanisms. This revised version was published online in August 2006 with corrections to the Cover Date.     

Atomic excitation by a simultaneous collision with another atom and with a photon

A new mechanism of atomic excitation is considered, a simultaneous collision with another atom and with a photon. The atomic excitation cross section is calculated. It is shown that for experimentally aehieveable electromagnetic field intensities and for other real parameter values the cross section is comparable to that of atomic excitation by electron impact.Presented in the V All-Union Conference in nonlinear optics and at the XVI scientific conference of the Moscow Physicotechnical Institute, November, 1970.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 66–71, September, 1972.