Knowledge Bank

A molecular beam optical Stark spectrum of the $C1E+(v=O)-X2t\omega =OnT00=16092.0cm-1)$ band system of scandium monofluoride. ScF, and the $B1n4v=0)-X2\Sigma +(v=OnT00=15885.8cm-1)$ band system of yllrium monofluoride. YF, have been recorded and analyzed. An electron bombardement ellusive oven was employed as the molecular beam source and collimation was sufficient to produce laser induced fluorescence line widths of MHz (FWHM). The low rotational levels of the $B1\Pi$ state of YF exhibit a first order Start shift from which an initial estimate of the permanent electric dipole moment is -1.OD. At higher field strengths $(>800V/cm)$, the optical spectra of both the ScF and YF also exhibit a second order Stark shift. The analysis of the second order shifts are in progress. Hyperline splittings the $B1\Pi (v=O)X2\Sigma +(v=0)$ band system of YF have been observed and analyzed in terms of magnetic hyperfine interaction in the excited state. The spectroscopic parameters are compared with sophisticated theoretical $predictions1$. and those estimated from a simple molecular orbital model.