Dissociation dynamics of NH3(Ã1A2). Experiment and theory

Michael N R Ashfold, CL BENNETT, RN DIXON

Research output: Contribution to journalArticle (Academic Journal)peer-review


The spectroscopy and predissociation of the vibronic levels of the Ã1A″2 excited states of NH3 and ND3 have been studied via Ã-X dispersed emission spectra, C′-à dispersed emission spectra and C′-à stimulated emission pumping, in each case following two-photon excitation to a selected intermediate level. The predissociation lifetimes span more than two orders of magnitude. The lowest levels predissociate by H(D) atom quantum tunnelling, the higher levels by vibrational rearrangement. A model calculation is presented to illustrate this mechanism for the v1= 1 levels of the à state, which are very short-lived.
Original languageEnglish
Pages (from-to)163-175
Number of pages13
JournalFaraday Discussions of the Chemical Society
Publication statusPublished - 1986


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