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Opacity analysis of the H 3 system: Modified rotating‐rod versus Frozen‐Orientation models
Author(s) -
Agmon Noam
Publication year - 1986
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550180912
Subject(s) - opacity , chemistry , orientation (vector space) , adiabatic process , excitation , rotation (mathematics) , bending , adiabatic theorem , energy (signal processing) , thermodynamics , atomic physics , molecular physics , mechanics , physics , optics , geometry , quantum mechanics , mathematics
The 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 H 3 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 + D 2 . 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.