Spectrometric and photographic analysis of laser-produced hydrogen plasma.

Abstract

Light from a neodymium glass laser was focused in hydrogen gas at pressures from 20 mTorrs to 9- 16 atm in order to produce optical breakdown. The forward scattered light from the breakdown region was spectrally analyzed with a grating spectrograph from 10, 300 to 10, 900 A. It was found that the spectral distributions exhibited no distinguishable frequency shift. However, the absorption of the laser light depended on frequency and gas pressure.