15min:

D. FORTHOMME, C. LINTON, D. W. TOKARYK, Centre for Laser, Atomic, and Molecular Sciences and Physics Department, 8 Bailey Dr., University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3; A . G. ADAM, A. D. GRANGER, L. E. DOWNIE, W. S. HOPKINS, Centre for Laser, Atomic, and Molecular Sciences and Chemistry Department, 30 Dineen Dr., University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3.

The A²E-X²A₁ transition of SrOCH₃ was first studied at high resolution by O'Brien et al. using a Broida oven. However lines with typically J\leq20 were not observed and congestion prevented them from resolving transitions from the =1/2 component of the upper state. We have studied the B²A₁-X²A₁ and the A²E-X²A₁ transitions of SrOCH₃ in a laser ablation molecular jet source, where jet cooling and low Doppler widths greatly simplified the spectra. An optical-optical double resonance technique facilitated definite assignments in a number of the transitions observed. Our analysis of the A²E-X²A₁ transition was straightforward, but a perturbation was observed in the B²A₁ K'=1 F₂ levels. A satisfactory fit was achieved for the B²A₁-X²A₁ transition when a separate B parameter was used to fit the perturbed levels.