15min:

JINJUN LIU, JOHN T. YI AND TERRY A. MILLER, Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210.

Our high-resolution laser-induced fluorescence (LIF) spectroscopy apparatus has been improved to study the deuterated isotopomers of the methoxy radical under jet-cooled conditions (T 2K). Doppler-free absorption spectra of iodine molecule were recorded simultaneously for absolute calibration, while relative calibration was done using the fringes of a new etalon. The spectral resolution (FWHM) for methoxy was limited to 300MHz by residual Doppler broadening and unresolved hyperfine structure. The center of spectral lines could be determined to 1/5 the FWHM with a comparable absolute accuracy (1 50MHz). The 3₀ ² and (6')₀ ¹ bands of the A²A₁--X²E_3/2 transition for CHD₂O and CH₂DO have been recorded, as well as the 3₀ ² and 6₀¹ bands for CH₃O and CD₃O. Rotational and fine structure for all bands has been resolved and assigned. Details of the analyses will be presented in the following talks.