The spin-forbidden vacuum-ultraviolet absorption spectrum of 14N15N

A. N. Heays*, B. R. Lewis, N. De Oliveira, W. Ubachs

*Corresponding author for this work

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Abstract

Photoabsorption spectra of 14N15N were recorded at high resolution with a vacuum-ultraviolet Fourier-transform spectrometer fed by synchrotron radiation in the range of 81-100 nm. The combination of high column density (3 × 1017 cm-2) and low temperature (98 K) allowed for the recording of weak spin-forbidden absorption bands' exciting levels of triplet character. The triplet states borrow intensity from 1Πu states of Rydberg and valence character while causing their predissociation. New predissociation linewidths and molecular constants are obtained for the states C3Πu(v = 7, 8, 14, 15, 16, 21), G3Πu(v = 0, 1, 4), and F3Πu(v = 0). The positions and widths of these levels are shown to be well-predicted by a coupled-Schrödinger equation model with empirical parameters based on experimental data on 14N2 and 15N2 triplet levels.

Original languageEnglish
Article number224305
Pages (from-to)1-13
Number of pages13
JournalJournal of Chemical Physics
Volume151
Issue number22
Early online date11 Dec 2019
DOIs
Publication statusPublished - 14 Dec 2019

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