Abstract
Measurements have been made of vibrational relaxation in mixtures of CO
2
with 10%
3
He, with 10%
o
-D
2
and with 3% HD in the temperature range 1000–360 K by means of a shock tube and a laser schlieren system. These results are compared with earlier measurements using other hydrogen isotopes and isomers. It is clear that there is vibration–rotation exchange between CO
2
and
n
-H
2
, HD and D
2
. However, the measured temperature dependence of energy transfer probabilities do not give clear evidence for the importance of long-range interactions in the coupling reaction. It is suggested that the unusually high efficiency of HD in relaxing CO
2
is due to the rate of rotational relaxation being a rate limiting process for H
2
and D
2
, but not for HD.
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