Infrared spectra of N2O-4He, N2O-3He, and OCS-3He complexes

  1. Get@NRC: Infrared spectra of N2O-4He, N2O-3He, and OCS-3He complexes (Opens in a new window)
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Journal titleThe Journal Of Chemical Physics
Pages25862591; # of pages: 6
AbstractInfrared spectra of the weakly bound complexes N2O-4He, N2O-3He, and OCS-3He have been observed using a tunable diode laser to probe a pulsed supersonic jet expansion. The rotational structure of the bands was analyzed using a conventional asymmetric rotor Hamiltonian. The N2O-3He and OCS-3He spectra are mostly a type (?Ka=0) in structure, with very weak b-type (??a = ?I ) transitions, but for N2O-4He the a- and b-type components are both prominent. The fitted rotational parameters are consistent with roughly T-shaped structures with intermolecular separations around 3.4-3.5 � for N2O-He and 3.8-3.9 � for OCS-He. The angle between the N2O or OCS axis and the He position is about 80� for N2O-He and 65� for OCS-He. The vibrational band origins are slightly blueshifted from those of the free molecule, with the N2O-He shifts (+0.2 cm-1) being about twice the magnitude of the OCS-He shifts (+0.1 cm-1). The results are of particular interest since N2O and (especially) OCS have both been used as probes in experiments on ultracold helium nanodroplets.
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AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12330218
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Record identifier23a86bb1-2a80-40cd-8757-2cdc90a8bd59
Record created2009-09-10
Record modified2017-03-23
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