INVESTIGATION OF THE B' STATE OF CaF AND CaCl
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Date
1998
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Ohio State University
Abstract
The $B'^{2}\Delta$ states of CaF and CaCl have been excited directly, under specific experimental conditions, through the $B^{\prime}2\Delta-X^{2}\Sigma^{+}$ forbidden transition, and detected by collecting the A-X or B-X fluorescence. Rotational analysis of the $B^{\prime}-X (0-0)$ band provides accurate molecular parameters in good agreement with those obtained previously by Verges $et al.^{a}$ in the case of CaF. For CaCl, the $B^{\prime 2}\Delta$ state, observed for the first time lies at $19232 cm^{-1}$ above the ground state, in excellent agreement with its position $(19319 cm^{-1})$ predicted by the Ligand Field Theory. The spin-orbit coupling constant $A^{SO}$ for CaF and CaCl are close, indicating that the molecular structure is mainly governed by the $Ca^{+}$ metal ion and only slightly by the ligand. Several excitation and deexcitation mechanisms, which may contribute, will be discussed.
Description
$^{a}$ Verges, Effantin, Bernard, Toupouzkhanian, Allouche, d'Incan and Barrow, J. Phys. B., A***. Mol. Opt. Phys., 26, 279-284 (1993)
Author Institution: Laboratoire de Photophysique Mol\'{e}culaire, Universit\'{e} Paris Sud
Author Institution: Laboratoire de Photophysique Mol\'{e}culaire, Universit\'{e} Paris Sud