A SUPERSONIC MOLECULAR BEAM OPTICAL STARK STUDY OF MoN
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Date
1993
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Ohio State University
Abstract
A high resolution optical Stark spectroscopic study of the $(0,0) A^{4}\Pi_{3/2}- X^{4}\Sigma_{1/2}$ band system of molybdenum mononitride, MoN, has been performed. A supersonic molecular beam sample was produced by skimming the products of a laser ablation (355nm, 5 mJ/pulse, 20 Hz)/reaction (5% $NH_{3}/Ar$) source. The spectra were recorded at a resolution of 50 MHz (FWHM) and in the presence of a static electric field of up to 3.5 kV/cm. Permanent electric dipole moments of 4.56(9)D and 3.38(7)D were determined for the $A^{4}\Pi$ and $X^{4}\Sigma^{-}$ states, respectively. These values agree well with the only theoretical $prediction^{1}$. The field free spectra for the $^{95}MoN$ and $^{97}MoN$ isotopic forms exhibit a large splitting which has been interpreted as arising from the magnetic hyperfine interaction in the $X{^{4}}\Sigma^-$ state. The resulting Fermi contact parameter, $b_{F}$, is of the same magnitude but opposite sign as the previous matrix isolated ESR $determination^{2}$.
Description
$^{1}$. J.N. Allison and W.A. Goddard, III J. Phys. Chem. 81, 263 (1983). $^{2}$. L.B. Knight, and J.Steadman, J. Chem. Phys. 76, 3378(1982).
Author Institution: Department of Chemistry, Arizona State University
Author Institution: Department of Chemistry, Arizona State University