HIGH-RESOLUTION FOURIER-TRANSFORM SPECTROSCOPY OF THE OVERTONE C-O STRETCH BAND OF METHANOL-D-3

In this work, high resolution Fourier transform infra-red (IR) spectru m corresponding to the weak overtone C-O stretch band of methanol-D-3 (CD3OH) has been recorded at a resolution of 0.004 cm(-1), in the rang e 1882-2012 cm(-1). The spectrum has the typical appearance of a Delta K= 0 spectrum of a near symmetric molecule and shows very complicated fine structure due the torsion-rotation-vibration interaction. It has been possible to identify eight different R- and P-sub-branch combina tions spanning a K value of 4. The assignments have been confirmed fro m combination relations using R- and P-branch transitions having the s ame upper level and accurately measured microwave (MW) and millimeterw ave (MMW) transitions in the ground vibrational state. Using the assig ned transitions a set of molecular parameters has been obtained for th e second excited C-O stretch state of CD3OH. (C) 1998 Elsevier Science B.V. All rights reserved.