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 H 2, HD and D 2. It has been found that at and below 300 K D 2 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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