Vibration-Rotation Spectra of 13C-Containing Acetylene: The ν1/ν2 + 2ν5 Fermi Dyad

✍ Scribed by G. Dilonardo; P. Ferracuti; L. Fusina; E. Venuti

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 662 KB
• Volume: 164
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1068

✦ Synopsis

High-resolution vibration-rotation spectra of ({ }^{13} \mathrm{C}{2} \mathrm{H}{2}) have been recorded in the wavenumber regions 1100-1240, 1730-1810, 2550-2700, and 3130-3280 (\mathrm{cm}^{-1}) at Doppler- or pressure-limited resolution. In these spectral ranges bands involving the (\nu_{1}) and (\nu_{2}) stretchings and the bendingstretching combination levels with (v_{2}=1, v_{4}=1, v_{5} \leqslant 2) have been analyzed. The main purpose of the analysis was the treatment of the Fermi resonance occurring between the (\nu_{1}\left(\Sigma_{B}^{+}\right))and the (\nu_{2}+2 v_{5}\left(\Sigma_{8}^{+}\right))levels, detected as (\nu_{1} \leftarrow \nu_{5}) and (\nu_{2}+2 \nu_{5} \leftarrow \nu_{5}) hot bands in the (4-\mu \mathrm{m}) region. The global analysis of all the observed transitions provided a set of 20 molecular parameters which fully characterize the stretching and bending-stretching combination states. The vibrational coupling terms which describe the Fermi resonance are also computed with high accuracy. 1994 Academic Press. Inc.