Čerenkov line radiation

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Abstract
Čerenkov radiation in the vicinity of atomic spectral lines in a gaseous medium was numerically calculated in an earlier paper of ours [J. H. You and F. H. Cheng, Acta Phys. Sinica 29, 927 (1980)]. The results showed that a new line-emission mechanism, the Čerenkov line mechanism, exists. The main characteristics are as follows: asymmetric profile, a small red shift of line, polarization (if the velocities of electrons are anisotropically distributed), and a large linewidth. The basic theory of Čerenkov line emission was then developed [J. H. You, T. Kiang, F. H. Cheng, and F. Z. Cheng, Mon. Not. R. Astron. Soc. 211, 667 (1984)]. In the present paper, the main formulas have been revised and simplified, and a systematic physical discussion is given. Furthermore, the causes of Čerenkov lines, and their basic characteristics are clarified.

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