THE PERMANENT ELECTRIC DIPOLE MOMENTS AND MAGNETIC HYPERFINE INTERACTON IN THE $A^{2}\Pi$ STATE OF YTTRIUM MONOSULFIDE, YS

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2003

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Ohio State University

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The optical Stark effect in the $(0,0) A^{2}\Pi - X^{2}\Sigma^{+}$ band systems of a yttrium monosulfide, YS , supersonic molecular beam sample have been analyzed to produce permanent electric dipole moments, $\mu$, for the $A^{2}\Pi_{3/2}$, and $A^{2}\Pi_{1/2}$ states of $5.9(2) D$, and $6.8(1) D$, respectively. Fine structure splitting in the field free $A^{2}\Pi_{3/2} - X^{2}\Sigma^{+}$ and $A^{2}\Pi_{1/2} - X^{2}\Sigma^{+}$ spectra were analyzed to produce the magnetic hyperfine spectroscopic parameters $a = -36(6)$ MHz, $c = 111(7)$ MHz, and $d = -107(6)$ MHz for the $A^{2}\Pi$ state. Transition frequencies of the low rotational lines in the $(0,0) A^{2}\Pi_{r} - X^{2}\Sigma^{+}$ band system were measured and analyzed to produce the first complete set of fine structure parameters for the $A^{2}\Pi_{r}$ state.

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Author Institution: Department of Chemistry and Biochemistry, Arizona State University

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