Laser-induced fluorescence and microwave-optical double resonance spectra of the ICl(A←X,19←0) vibronic band: Measurement of the Cl atom hyperfine structure

Jeffrey R. Johnson, Timothy J. Slotterback, David W. Pratt, Kenneth C. Janda*, Colin M. Western

*Corresponding author for this work

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

14 Citations (Scopus)

Abstract

Fluorescence excitation spectra of the A, 3Π1 ← X, 1Σ+ electronic transition of I35Cl have been obtained by using a single-frequency dye laser and a collimated molecular beam. The 5-MHz resolution of the spectra is sufficient to resolve the Cl atom hyperfine structure of the A, 3Π1, state for the first time. The values obtained for the I atom hyperfine constants also are improved. Assignments of the highly structured spectra were confirmed by microwave-optical double resonance using previously assigned microwave transitions in the X, 1Σ+, ground electronic state. Unlike the hyperfine constants of the X and B, 3Π0 states, those of the A state differ markedly from the predictions of simple models based on molecular orbital descriptions of the electronic structure. This data will provide a very sensitive test of quantum calculations for the excited electronic state.

Original languageEnglish
Pages (from-to)5661-5664
Number of pages4
JournalJournal of Physical Chemistry
Volume94
Issue number15
Publication statusPublished - 1 Dec 1990

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