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The C–C–H Bending Vibration Mode (ν4) in the Electronic Ã2Π and X2Σ+ States of the CaCCH Radical

✍ Scribed by Mingguang Li; John A. Coxon

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 215 KB
Volume: 196
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1999.7846

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✦ Synopsis

The first excited C-C-H bending vibration levels in the CaCCH A ˜2⌸ and X ˜2⌺ ϩ states have been rotationally analyzed through cw dye laser excitation spectroscopy of the 4 1 1 band. The upper state is subject to Renner-Teller and spin-orbit splittings. Strong K-type resonance interactions were observed between the nearby 2 ⌬ and 2 ⌺ vibronic components. A total of 667 rotational lines were recorded with high precision and fitted to a model involving a full matrix treatment of the interactions. The Renner-Teller parameter has been determined as ⑀ 4 4 ϭ 1.85(4) cm Ϫ1 .

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