High-resolution study of the 000–000 band of the Ã1A″–X 1A′ system of HNO in emission from the H + NO reaction

Abstract

A high-resolution spectrum of the 000–000 band of the ùA″–X ¹A′ system of HNO has been recorded in emission from the reaction of the H atoms with NO. No sharp breaking-off in the J structure has been found in the highest sub-band observed. The emission in this sub-band (K^′_a= 13–K^″_a= 12) originates in levels above the dissociation limit and arises from a two-body radiative association process. The emission in the other sub-bands originates in levels below the dissocation limit and arises from a three-body recombination process.

The mechanism for predissociation is discussed and an interpretation has been given for a hitherto unexplained observation.