Vibrationndash;vibration energy exchange processes in the collision systems H35Cl(1)+H37Cl(1), H35Cl(1)+H35Cl(1), and H37Cl(1)+H37Cl(1) have been investigated over the temperature range 100ndash;1000thinsp;deg;K based on a longhyphen;lived collision model. It is found that the isotopic energy exchange process H35Cl(1)+H37Cl(1)rarr;H35Cl(2)+H37Cl(0) is the most efficient, whereas the production of H37Cl(2) from the same initial state is the least efficient. A negative dependence of energy exchange probability on temperature is found for all four processes over the temperature range.
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