Rotational effects in the dissociative recombination process of H2++e

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Abstract
Rotational effects on the dissociative recombination (DR) of the system H2++e are investigated using multichannel quantum defect theory (MQDT). An explicit MQDT formula is obtained to show the rotational effect. The cross section calculated with the formula has a resonance structure induced by the rotation. Its magnitude sensitively depends on the initial rotational state in some cases. The mechanism of the rotational effect is discussed in two parts: the direct (open channel) contribution and the indirect (closed channel) one. The rotational motion affects the vibronic interaction and the configuration interaction between the initial and the final dissociative state. The rotational effect on the rate constant is also discussed. The resonance structure induced by the rotation appears even after averaging with an initial rotational distribution which may be appropriate to experimental conditions. The resulting structure, however, is not necessarily in agreement with experiment. Due to the rotational effect, the DR turns out to depend on the nuclear spin, especially at low temperatures.

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