15min:

A. G. ADAM AND W. S. HOPKINS, Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada E3B 6E2; C. LINTON, D. W. TOKARYK AND A. G. READ, Physics Department, University of New Brunswick, Fredericton, NB, Canada E3B 5A3.

Visible laser excitation spectra of the B ~²A₁ X ²A₁ system of four isotopomers of strontium monomethoxide have now been recorded. By examining the effect of isotopic substitution on the spectra, we hope to determine the structural parameters in the ground and excited states, and examine how the molecular structure changes on excitation. The radicals were produced in a laser ablation apparatus using a 1.5 % mixture of ¹²CH₃OH, ¹³CH₃OH, ¹²CD₃OD and ¹³CD₃OD entrained in helium, and high resolution spectra were recorded using a CR 699 autoscan dye ring laser. The analysis used an effective Hamiltonian given in the literature, and the results of the analysis will be presented.