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

Journal Article · Thu Jul 26 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a010· OSTI ID:6478962

Johnson, J R; Slotterback, T J; Pratt, D W; Janda, K C ^[1]; Western, C M ^[2]

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1. Univ. of Pittsburgh, PA (USA)
2. Univ. of Bristol (England)

Fluorescence excitation spectra of the A, {sup 3}II{sub 1} {l arrow} X, {sup 1}{Sigma}{sup +} electronic transition of I{sup 35}Cl 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, {sup 3}II{sub 1}, 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 transition in the X, {sup 1}{Sigma}{sup +}, ground electronic state. Unlike the hyperfine constants of the X and B, {sup 3}II{sub 0} 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.

• OSTI ID: 6478962
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CHLORINE
DATA
DATA ANALYSIS
ELEMENTS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HALOGENS
HYPERFINE STRUCTURE
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NONMETALS
NUMERICAL DATA
SPECTROSCOPY