VIBRATIONAL CONSTANTS FOR CaCl, SrCl ($X^{2}\Sigma^{+}, A^{2}\Pi, B^{2}\Sigma^{+}$) UP TO $V\approx$ 40
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Date
1981
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Ohio State University
Abstract
During the lash few years high precision spectroscopy with dye lasers has been extensively done for the cited molecular states. However, usually only the vibrational levels (in general V^{\prime}, $V^{\prime\prime}\leq4$, in single cases V^{\prime}, $V^{\prime\prime}\leq 10$) have been rotational analyzed, and vibrational rotational constants have been given in terms of Dunham coefficients. These sometimes vary appreciably between different puplications due to the number of vibrational levels included. As the Dunham expansion usually has a rather poor convergence behaviour, extrapolation from known vibration/rotation levels to higher ones may cases fail significantly. We have made an attempt to deduce vibrational constants by solving the Schroedinger equation with a known potential: namely a fitted potential proposed by Klynning and Martin [1] which is dominated by the known ionic behaviour of the alkaline earth monohalides in their low electronic states. The determined vibrational structure is compared to the constants extracted from chemiluminescence spectra (vibrational levels up to $v\approx$ 40). This provides a certain test as to how far up in potential energy the approximation by the ionic potential may be valid.
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[1] L. Klynning, H. Martin; Physica Scripta 22, 221 (1980)
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