			15min:

HIGH PRECISION MEASUREMENT OF C-O STRETCHING BAND OF CH₃OH USING CO₂ LASER SIDEBANDS.

Z. D. SUN, F. MATSUSHIMA, S. TSUNEKAWA AND K. TAKAGI, Department of Physics, Toyama University, Toyama 930-8555, Japan..

Microwave sidebands of CO₂ laser lines have been used as an infrared power source to measure the sub-Doppler vibration-rotation frequencies of CH₃OH in the C-O stretching band precisely. More than one hundred frequencies of CH₃OH have been measured. Over thirty groups of unresolved lines in the Fourier-transform spectrum have been resolved. Combined with our previous infrared-microwave double resonance results and the ground state ( upsilon _co = 0) term values given in literature, many term valves of CH₃OH in the upsilon _co = 1 stretching states have been refined. For A species in upsilon _co = 1, 22 asymmetry splittings for various K in upsilon _t = 0 and 1 have been observed for the first time. The present results provide precision data to refine the molecular constants in the first excited C-O stretching state of CH₃OH.