Abstract
The interaction between NO(X 2π) and metastable He(2 3S) atoms has been investigated by emission spectrometry. Several reaction channels have been identified, leading to NO +(A 1π), or to electronically excited N or O atoms. The NO +(A +π-X 1Σ +) banded emission spectrum was observed in the range 123-190 nm, and it was analyzed for vibrational and rotational populations. The NO +(A) state vibrational distribution, determined with a new set of Franck—Condon factors for NO +(A–X), is in approximate accord with the calculated NO + (A) - NO(X) Franck—Condon (FC) factors; however the υ' = 2 – 5 levels are overpopulated relative to the FC values. The NO +(A) state rotational populations are shifted to higher J-values than the precursor, NO(X). Emission was observed from several excited states of O and N in both the vacuum ultraviolet and red regions of the spectrum. Comparison of total rates from excited atomic fragments with emissions from NO +(A) showed that the cross-section for dissociative excitation was similar to that for Penning ionization giving NO +(A).
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