ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
A model for pressure narrowing in collision-induced absorption is developed, using transition probabilities given by the Ornstein–Uhlenbeck process, with Gaussian induced dipole moments. The autocorrelation function for this model can be obtained analytically, and its principal properties readily described. The resultant line shape is a three-parameter function, which exhibits both peak narrowing and base broadening. The transition to the narrowed line shape is found to be gradual. It is found that if angular modulation is ignored, the resultant line shape has a cusp about zero frequency, so that angular modulation contributes not only quantitatively, to the width of the line, but qualitatively, to the line shape. These results are model independent. By including angular modulation, the line shape obtained is also descriptive of the overlap-induced component of the Q branch. The last comprises a generalization of the Levine–Birnbaum line shape to include pressure narrowing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.450837
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