Analysis of the band system of allene |
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Authors: | J. Chazelas J. Plíva A. Valentin L. Henry |
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Affiliation: | Laboratoire de Spectronomie Moléculaire CNRS 060136, Université Pierre et Marie Curie, 4 Place Jussieu, 75230 Paris Cedex 05, France |
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Abstract: | The infrared spectrum of allene has been recorded with high resolution (0.002-0.004 cm?1) on a Fourier transform instrument in the region 730 to 1170 cm?1 containing the perpendicular bands, ν9 and ν10. A total of 21 subbands with KΔK ranging from ?6 to +14 have been assigned in the ν9 band, and 26 subbands with KΔK = ?10 to +15 have been assigned in the ν10 band. The bands are affected by a combination of a Jz-Coriolis and a quartic anharmonic interaction between their upper states ν9 and ν10. In addition, several other more localized perturbations are found in the spectrum. The nature of the interactions responsible for these perturbations is discussed, and five of the strongest perturbations are quantitatively accounted for by constructing a Hamiltonian matrix which includes five different perturbing states and their Coriolis and anharmonic resonances with the ν9 and ν10 upper states. A set of spectroscopic constants for the ν9 and ν10 states and for some of the perturbing states is reported. |
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