# ON THE A-X SYSTEM OF THE CALCIUM MONOMETHOXIDE RADICAL

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 Title: ON THE A-X SYSTEM OF THE CALCIUM MONOMETHOXIDE RADICAL Creators: Crozet, P.; Ross, A. J.; Linton, C.; Dick, M. J.; Adam, A. G.; Hopkins, Scott Issue Date: 2003 Abstract: Laser excitation spectra of the $A{^{2}}E \leftarrow X{^{2}}A_{1}$ system of four isotopomers of calcium methoxide were recorded at the University of New Brunswick. The radicals were produced in a laser ablation source, using a 1.2% mixture of methanol $^{12}CH_{3}OH, ^{13}CH_{3}OH, ^{12}CD_{3}OD$ and $^{13}CD_{3}OD$) in He as a precursor. High resolution spectra were recorded in the range $15870 - 15985 cm^{-1}$ and $16320 - 16500 cm^{-1}$(F.W.H.M. 250 MHz) using a tunable, single-mode cw dye laser (CR 699 + autoscan), operating with DCM and Kiton red dyes. The transitions were assigned to the two spin-orbit components $A{^{2}}E_{3/2} \leftarrow X^{2}A_{1}$ and $A^{2}E_{1/2} \leftarrow X^{2} A_{1}$ of the origin band, and of a band with v'$_{4}(Ca-[OCH_{3}] stretch) = 1$. Resolved J and K structures are observed. The analysis used an effective Hamiltonian given in the $literature^{a}$. The fits build on earlier work on the main $isotopomer^{b}$, and include spectroscopic data for the $B \leftarrow X$ system given in the $literature.^{cd}$ We obtain structural parameters for the calcium monomethoxide radical from the rotational constants obtained from the different isotopomers. URI: http://hdl.handle.net/1811/21085 Other Identifiers: 2003-WF-08