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Title: Classical line shapes based on analytical solutions of bimolecular trajectories in collision induced emission. II. Reactive collisions
Author: Reguera, D. (David)
Rawlings, Philip K.
Birnbaum, George
Keywords: Col·lisions (Física)
Gasos rars
Química física
Enllaços químics
Collisions (Physics)
Rare gases
Spectrum analysis
Physical and theoretical chemistry
Chemical bonds
Issue Date: 14-Jun-2013
Publisher: American Institute of Physics
Abstract: The classical theory of collision induced emission (CIE) from pairs of dissimilar rare gas atoms was developed in Paper I [D. Reguera and G. Birnbaum, J. Chem. Phys. 125, 184304 (2006)] from a knowledge of the straight line collision trajectory and the assumption that the magnitude of the dipole could be represented by an exponential function of the inter-nuclear distance. This theory is extended here to deal with other functional forms of the induced dipole as revealed by ab initio calculations. Accurate analytical expression for the CIE can be obtained by least square fitting of the ab initio values of the dipole as a function of inter-atomic separation using a sum of exponentials and then proceeding as in Paper I. However, we also show how the multi-exponential fit can be replaced by a simpler fit using only two analytic functions. Our analysis is applied to the polar molecules HF and HBr. Unlike the rare gas atoms considered previously, these atomic pairs form stable bound diatomic molecules. We show that, interestingly, the spectra of these reactive molecules are characterized by the presence of multiple peaks. We also discuss the CIE arising from half collisions in excited electronic states, which in principle could be probed in photo-dissociation experiments.
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It is part of: Journal of Chemical Physics, 2013, vol. 138, num. 22, p. 224109-1-224109-10
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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