Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
115 (2001), S. 1335-1339
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We present results of quantum mechanical scattering calculations on the vibrational relaxation of CO induced by collisions with 3He at ultracold temperatures and compare them with the corresponding results for the 4He–CO system. The low energy cross sections are controlled by shape resonances supported by the van der Waals well. For a thermal rotational population the cross sections for the quenching of the v=1 vibrational level are larger for 3He than for 4He collisions. Because of the absence of a Feshbach resonance, the cross sections at low energies for the quenching of the j=1 rotational level are much smaller than those for 4He–CO. Very good agreement is found for the rate coefficients for the vibrational relaxation of the v=1 level with the measurement data that are available at temperatures above 35 K. There are small discrepancies between the calculated rate coefficients with earlier calculations for the relaxation of the v=1 vibrational level, similar to those found for 4He–CO collisions, but the discrepancies tend to be larger with decrease of temperature. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1379581
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