Spectroscopy of the excited C-O stretching Q branch of 13CD 3OH: Measurement and assignment of new FIR laser lines

Abstract

The Q branch of the C-O stretching fundamental band of 13CD 3OH has been investigated. Starting from a high resolution (4 × 10 −3cm −1) infrared Fourier transform spectrum and using a waveguide CO 2 laser of 300 MHz tunability and an acoustooptic modulator for an extension of ±90 MHz, 31 new FIR laser lines have been observed. The related absorptions have been measured by means of optoacoustic detection. The frequency of one new FIR laser line was also measured. Eight tentative assignments are proposed for the IR absorption and FIR laser emissions.