Abstract
Single-shot photographic spectra from 3300 to 6200 Å have been obtained from 6.5-MeV electron beams propagating in air at 0.2-Torr pressure. Spectra at this pressure exhibit the effects of the beam self-magnetic field compressing the plasma into a hot central core. The core is spectrally characterized by nitrogen- and oxygen-ion emissions with an obvious continuum. The core temperature is estimated to be 39,000 K from time-integrated ion-line ratios. A time-integrated electron density of 1 × 1016 cm−3 is estimated from H-β line broadening in the core. Spectra taken at 2, 10, and 50 Torr are totally dominated by nitrogen molecular emission. Vibrational temperatures of a few thousand degrees kelvin are estimated from time-integrated spectra, with the temperature decreasing with increasing pressure.
© 1985 Optical Society of America
Full Article | PDF ArticleMore Like This
Leping Li, Bing-Xin Yang, and P. M. Johnson
J. Opt. Soc. Am. B 2(5) 748-752 (1985)
K. D. Pedrotti, A. J. Mendelsohn, R. W. Falcone, J. F. Young, and S. E. Harris
J. Opt. Soc. Am. B 2(12) 1942-1947 (1985)
Keith D. Bonin, T. J. McIlrath, and Kouichi Yoshino
J. Opt. Soc. Am. B 2(8) 1275-1283 (1985)