THE PRESSURE BROADENING THEORY OF $BrCN^{*}$
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Date
1954
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Ohio State University
Abstract
The pressure broadening theory of P. W. $Anderson^{1}$ is applied to the self broadening of BrCN. The large collision diameter $reported^{2}$ for the $J = 2$ to $J - 3$ transition could not be obtained by the pure first-order dipole-dipole resonance interaction considered by Anderson. By extending the calculations to include all possible first-order dipole-dipole interactions, it is possible to obtain good agreement between the theoretical and experimental collision diameters. (At a temperature of $100^{\circ} C$ the theoretical collision diameter is $19.3\AA$ compared to the experimental collision diameter of $19.0\AA$.) The nonresonant dipole-dipole interactions play an important role because of the comparatively large populations of the higher J states. Second-order dipole-dipole interactions increase the theoretical collision diameter slightly. It also appears possible to explain the temperature dependence of the collision diameter and the J dependence of the collision diameter on the basis of these calculations.
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$^{*}$This work was supported by the U. S. Air Force, through the Office of Scientific Research of the Air Research and Development Command. $^{1}$ P. W. Anderson, Phys. Rev. 76:647 (1949) $^{2}$ Ralph Trambarulo, Henry Lackner, Paul Moser, and Harold Feeny, Bull. Am. Phys. Soc. 29:34 (1954)
Author Institution: Department of Physics, University of Delaware
Author Institution: Department of Physics, University of Delaware