Molecular beam Stark spectroscopy of theCthinsp;1Sgr;+ndash;Xthinsp;1Sgr;+(0,0) band of yttrium monochloride

摘要

The yttrium monochloride molecule (YCl) has been produced in a free jet molecular beam apparatus by chemical reaction in a laserhyphen;produced plasma. The origin band of theCthinsp;1Sgr;+ndash;Xthinsp;1Sgr;+system of YCl was probed at the subhyphen;Doppler resolution of 120 MHz using a ring dye laser to excite fluorescence. Spectra due to the two isotopomers89Y35Cl and89Y37Cl were obtained, and molecular constants determined. The following bond lengths were derived (89Y35Cl):r0(X)=2.384thinsp;78(36) Aring;,r0(C)=2.460thinsp;50(40) Aring; (2sgr; error bounds). Results for the ground state are in good agreement with those recently reported by Xinetal. lsqb;J. Mol. Spectrosc.148, 59 (1991)rsqb;. The permanent electric dipole moments for both theXandCstates were determined by performing molecular beam Stark spectroscopy on the linesP(1) andR(0), respectively. Values of 2.587(29) D (Xstate) and 3.258(36) D (Cstate) were obtained. Results are compared withabinitiopredictions of the molecular parameters, and a molecular orbital interpretation of the bonding is presented.