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Gas Phase LIF Study of theb1Σ+(b0+) ↔X3Σ−(X10+,X21) Transition of NI

✍ Scribed by O. Shestakov; R. Gielen; K.D. Setzer; E.H. Fink

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
279 KB
Volume
192
Category
Article
ISSN
0022-2852

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✦ Synopsis

First gas phase spectra of the nitrogen monoiodide radical NI are reported. The b 1 ⌺ ϩ (b0 ϩ ) 7 X 3 ⌺ Ϫ (X 1 0 ϩ , X 2 1) transition of NI has been studied by laser-induced fluorescence measurements. Ground state NI radicals were generated in a fast-flow system by reaction of microwave-discharged nitrogen with iodine vapor. Vibrational levels v ϭ 0, 1, and 2 of the b 1 ⌺ ϩ state were excited with a pulsed dye laser. Rotational and vibrational constants of the X 3 ⌺ Ϫ and b 1 ⌺ ϩ states were deduced from analysis of high-resolution excitation spectra. Time-resolved measurements of the fluorescence decay and measurements of relative line and band intensities allowed determination of the radiative lifetime of the b state, of band transition probabilities, and of the ratio of transition moments 0 / 1 for the b0 ϩ 3 X 1 0 ϩ and b0 ϩ 3 X 2 1 subtransitions. Comparison of calculated and experimental line intensities and FC factors shows that treatment of the X 3 ⌺ Ϫ state in terms of a Hund's case (a) formalism is preferable to use of a case (c) formalism.

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