TITLE

Effects of helium upon electron beam excitation of N+2 at 391.4 and 427.8 nm

AUTHOR(S)
Brake, M. L.; Gilgenbach, R. M.; Lucey, R. F.; Pearce, K.; Repetti, T.; Sojka, P. E.
PUB. DATE
September 1986
SOURCE
Applied Physics Letters;9/22/1986, Vol. 49 Issue 12, p696
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Relativistic electron beam interactions with very small ratios of nitrogen to helium (10-1–10-4) have been found to produce extremely large N+2(B2Σ+u–X2Σ+g) intensities at 391.4 and 427.8 nm, compared to line intensities originating from helium. These results occurred in the total pressure regime of 0.1–500 Torr. The pressure scaling results presented here are inconsistent with previously proposed kinetic mechanisms for the N+2 laser pumped by helium. With a simple model of the chemical kinetics, we show that this effect is due to the collisional transfer of energy between excited states of helium atoms and the ground state of N+2.
ACCESSION #
9820890

 

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