Abstract
The ionization of dense sodium vapour in presence of various buffer gases by high power density light tuned to 3S → 3P transition was investigated. The by Measures proposed process of impact ionization by electrons heated in superelastic collisions was considered to be predominant. It was found, that the decrease of the ionization rate by a high pressure noble gas takes place due to the shortening of the effective lifetime of 3P-excited sodium atoms or due to formation of sodium-noble gas quasimolecules. The decrease of the time of imprisonment of the resonance radiation with the increase of the electron density was observed.
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