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
Publisher: Ohio State University
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.
Description: $^{a}$ X. Liu, C.P. Damo, T.-Y. D. Liu, S. C. Foster, P. Misra, L. Yu and T. A. Miller J. Phys. Chem 93 2266-2275 (1989) $^{b}$ P. Crozet, F. Martin, A.J. Ross, C. Linton, M.J. Dick and A.G. Adam J. Mol. Spectrosc. 213 28-34 (2002) $^{c}$ C. J. Whitham, S. A. Beaton, Y. Ito and J. M. Brown J. Mol. Spectrosc. 191 286-294 (1998) $^{d}$ K. C. Namiki, J. S. Robinson and T. C. Steimle J. Chem. Phys. 13 5283-5289 (1998)
Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (UMR 5579 CNRS), B\v{a}timent A. Kastler, Universit\'{e} Lyon I, Domaine Scientifique de la Doua; Physics Department, University of New Brunswick; Department of Chemistry, University of New Brunswick
URI: http://hdl.handle.net/1811/21085
Other Identifiers: 2003-WF-08
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