Polarization-interference effects in the bremsstrahlung of quasiclassical electrons on ions with a core |
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Authors: | V A Astapenko |
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Institution: | (1) Moscow Institute for Physics and Technology, 141700 Dolgoprudnyi, Moscow Region, Russia |
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Abstract: | The polarization dependence of the stimulated bremsstrahlung and inverse bremsstrahlung (SBIB) of quasiclassical electrons
on highly charged ions with a core is calculated in the approximation of a specified Coulomb current. Emission frequencies
close to an eigenfrequency of the ion core are considered. The contributions of the static and polarization channels are taken
into account in the amplitude of the process. When the nondipole nature of the interaction between the incident particle and
a resonant transition in the ion core is taken into account, interference between these channels causes the spectral-amplitude
characteristics of the process to assume a specific dependence on the angle α between the electric field intensity vector of the electromagnetic wave and the initial velocity vector of the incident particle.
This dependence, which persists after integration of the cross section over the scattering angle of the incident particle,
causes interference effects, viz., asymmetry of the line shape and dips in the dependence of the SBIB cross section on electric
field intensity, to appear for α=π/2 and significantly reduces them for α=0.
Zh. éksp. Teor. Fiz. 115, 1619–1629 (May 1999) |
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