Infrared spectrum of the OCS--He complex

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Journal titleThe Journal Of Chemical Physics
Pages30533056; # of pages: 4
Subjectcarbon compounds; helium neutral atoms; infrared spectra; oxygen compounds; quasimolecules; rotational states; vibrational states
AbstractThe weakly-bound van der Waals complex OCS�He has been observed by infrared spectroscopy in the region of the OCS nu1 vibration ([approximate]2062 cm�1) in a pulsed supersonic jet expansion using a tunable diode laser probe. The results are in good agreement with previous microwave observations of OCS�He, but they extend to the vibrationally excited state, as well as to a considerably larger number of rotational levels with higher J-values. Prominent a-type transitions (DeltaK = 0) are observed, together with weaker b-type transitions (DeltaK = �1). The rotational energy level pattern in the excited vibrational state is quite similar to that in the ground state, and the band origin is slightly blue-shifted (+0.111 cm�1) from that of the free OCS molecule. These results are of special interest due to recent observations in the same spectral region of OCS molecules trapped in ultra cold helium droplets.
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12328730
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Record identifierd8fbf1a9-e1e4-4498-9c42-ad761421dc4d
Record created2009-09-10
Record modified2017-03-23
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