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High-Resolution Absorption Spectroscopy of the 3ν1 and 3ν1 + ν3 Bands of Propyne

✍ Scribed by Alain Campargue; Elena Bertseva; Georges Graner; Michel Herman

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
157 KB
Volume
201
Category
Article
ISSN
0022-2852

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✦ Synopsis

The 3 1 and 3 1 ϩ 3 bands of propyne have been recorded at Doppler-limited resolution by Fourier transform spectroscopy and intracavity laser absorption spectroscopy, respectively. The two bands show a mostly unperturbed J rotational structure for each individual K subband. However, as a rule the K structure ordering is perturbed in overtone transitions of propyne and different effective parameters associated with each K subband have been determined. From the vibrational energy levels, a value of Ϫ6.6 cm Ϫ1 has been obtained for the x 13 cross anharmonicity in perfect agreement with the origins of the 1 ϩ 3 and 2 1 ϩ 3 combination bands estimated from the FTIR spectrum. Hot bands from the v 9 ϭ 1 and v 10 ϭ 1 levels associated with the 3 1 ϩ 3 combination band have been partly rotationally analyzed and the retrieved values of x 39 and x 3,10 are in good agreement with literature values. Finally, the 4 1 ϩ 9 Ϫ 9 band centered at 12 636.6 cm Ϫ1 has been recorded by ICLAS. The red shift of this hot band relative to 4 1 and the ⌬B v value are discussed in relation to the anharmonic interaction between the 4 1 and 3 1 ϩ 3 ϩ 5 levels.

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