Self-similar collisional processes in plasma

S. S. Kharintsev; Myakzyum Kh. Salakhov

doi:10.1117/12.375322

14 January 2000 Self-similar collisional processes in plasma

S. S. Kharintsev, Myakzyum Kh. Salakhov

Proceedings Volume 4061, IRQO '99: Quantum Optics; (2000) https://doi.org/10.1117/12.375322
Event: Eighth International Readings on Quantum Optics: IRQO '99, 1999, Kazan, Russian Federation

Abstract

The influence of speed-changing self-similar collisions on the spectral lien shape is considered in terms of the classical Fourier integral theory. The self-similar mechanism of interference of scalar perturbations for phase shifts of an atomic oscillator is developed. The motion of a radiating dipole in a perturbed gas is examined in the framework of the self-similar diffusion model. A general formula for the correlation function, which allows for a combined effect of speed-dependent Doppler and pressure broadening, is derived. In the Doppler regime this formula yield the self-similar Galatry profile and in the case when speed-changing collisions are neglected it leads to the self-similar Voigt profile. In the limiting case when the self-similar character of collisions is omitted these profiles become identical to the Galatry profile and Voigt profile respectively. It is shown that self-similar collisions are of important in a low and high pressure region for far IR and radio lines. In general case spectral profiles broadened by the self-similar collision mechanism are asymmetric, the line shape depends on a type of the interference of scalar perturbations. In the Doppler regime self-similar collisions give rise to the additional spectral line Dicke-narrowing.

Citation Download Citation

S. S. Kharintsev and Myakzyum Kh. Salakhov "Self-similar collisional processes in plasma", Proc. SPIE 4061, IRQO '99: Quantum Optics, (14 January 2000); https://doi.org/10.1117/12.375322

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