Low temperature vibrational relaxation of carbon monoxide by light mass species |
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Authors: | D.C. Allen T.J. Price C.J.S.M. Simpson |
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Affiliation: | Physical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK |
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Abstract: | The rates of deactivation of CO(v=1) by 4He and by 3He have been measured between 300 K and 80 K using a pulsed laser fluorescence technique. The results show the usual strong deviation from Landau—Teller behaviour and a marked isotope effect. Comparison is made with theoretical predictions including a one-dimensional treatment which takes account of attractive forces. The present results are compared also with earlier work on the deactivation of CO by H2, HD and D2. It has been found that at and below 300 K D2 is less efficient than 4He in the (VT) deactivation of CO (v=1) and HD is anomalously efficient. The latter effect is attributed to the involvement of rotational transitions. |
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