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

Brake, M. L.; Gilgenbach, R. M.; Lucey, R. F.; Pearce, K.; Repetti, T.; Sojka, P. E.
September 1986
Applied Physics Letters;9/22/1986, Vol. 49 Issue 12, p696
Academic Journal
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.


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