Abstract
AbstractThe Rotating‐Rod Model is modified to make the adjustable α parameter which appears in the treatment energy dependent. Its predictions for opacity and excitation functions compare well with quasi‐classical H3 trajectory results, for translational and vibrationalenergy variations and isotopic mass effects. The Frozen‐Orientation Model in its present form is incapable of such an agreement for mass combinations other than H + D2. It is suggested that the decreaseof α with energy can be interpreted as a transition from adiabatic tosudden behavior, where alignment is only on the average, and much energy isdeposited in the bending modes. This is supported by a correlation between α and the average final rotation.
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