Predissociation in N2(C'4, 1 Sigma U +) and other N2 states and its importance in the atmospheres of Titan and Triton

Details Predissociation in N2(C'4, 1 Sigma U +) and other N2 states and its importance in the atmospheres of Titan and Triton Predissociation in N2(C'4, 1 Sigma U +) and other N2 states and its importance in the atmospheres of Titan and Triton

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sric.rept.....s&link_type=abstract

Annual Report SRI International Corp., Menlo Park, CA. Molecular Physics Lab.

Physics

Gas Dissociation, Molecular Energy Levels, Nitrogen, Photoexcitation, Satellite Atmospheres, Upper Atmosphere, Electron Bombardment, Titan, Triton

Scientific paper

The objectives of this program are to further the understanding of the upper atmospheres of Titan, Triton, and the Earth in terms of the observed emissions of the 13-14 eV states of N2. These states are generated at quite high rates, yet very little emission is observed from them. The reasons are complex, involving resonance trapping and predissociation, and it is desired to quantify the effects of predissociation, particularly on the c4' 1 Sigmau,+ state of N2. Earlier experiments had indicated that predissociation of the c4' state was of little importance, yet over the last two years a growing body of evidence has shown that for levels above v = 2, predissociation is in fact a major process. It is the v = 0 level for which production by electron bombardment and photoexcitation is highest, and so it has been most important to evaluate the effects of predissociation on this particular level. The goal has been to target c4' (v = 0) for a thorough analysis, in which both the extent of predissociation as a function of rotational level and the atomic product branching ratio, where the only possible products are N(4S) + N(4S) and N(2D) + N(4S), are determined. For the first year of funding, the intention was to demonstrate two-photon excitation of the intermediate N2(a1 Pig) state, so that the gap to the 13 eV energy region could be bridged, and then use a second laser to reach the c4' state itself.

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