Sub-Doppler spectroscopy of the Ã2+- X̃ 2Π and B̃ 2Π-X̃ 2Π transitions of NCO

Nicola L. Elliott, James A.J. Fitzpatrick, Colin M. Western

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Abstract

Sub-Doppler laser induced florescence spectra were recorded of a selection of bands within the à 2 + - X̃ Π2 and B̃ Π2 - X̃ Π2 transitions of NCO in a supersonic molecular beam. The light source was a diode seeded optical parametric oscillator, which gave an effective resolution of 0.01 cm-1 in the ultraviolet. Analysis of the à 2 + - X̃ Π2 transition at high resolution allowed fitting of both the fine and hyperfine structures, and a set of rotational and hyperfine constants were obtained for 13 vibronic levels within the à 2 + state including levels of both 2 + and Π2 vibronic characters. Analysis of the 000 and 101 bands of the B̃ Π2 - X̃ Π2 transition, together with a band from the à 2 + state at the same energy, was also performed. These did not reveal any hyperfine structure although the resolution was the same as the work at lower total energy, and this observation is discussed. Refined rotational constants and perturbation parameters for the interaction between the à and B̃ states were also obtained.

Original languageEnglish
Article number164301
JournalJournal of Chemical Physics
Volume129
Issue number16
DOIs
StatePublished - Jan 1 2008
Externally publishedYes

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