INFRARED OPTOACOUSTIC SPECTROSCOPY OF (CD3OD)-C-13 AROUND THE 10R AND10P CO2-LASER LINES

In this work we present the results of an investigation about Doppler limited infrared absorbing transitions of the C-O stretching vibration al mode of (CD3OD)-C-13 by means of optoacoustic detection. This techn ique is an alternative, more sensitive and of higher resolution than t he Fourier transform spectroscopy which is applied to this methanol is otopomer, due to the contamination problem associated with the fast ex change of OD by OH in the molecule. Using a waveguide CO2 laser of 290 MHz tunability on each line we were able to observe 69 absorptions, m ost of then of large offset. The data will be useful in theoretical an alysis of this sample, as well as a guide in the search for new FIR la ser lines.