The CD3OH molecule has been investigated for new far-infrared laser lines by optically pumping with a cw waveguide CO2 laser. The increased tunability (300 MHz) with respect to a conventional CO2 laser permits to pump many new CD3OH lines. As a consequence 108 new laser lines have been discovered, ranging from 42.9 to 1155 μm in wavelength. On some lines the effect of an electric Stark field has been investigated demonstrating a laser frequency tuning. The total number of known FIR laser lines from CD3OH is increased to about 340 making this molecule the most prolific together with CH3OH.
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Carelli, G., Ioli, N., Moretti, A. et al. New large offset far-infrared laser lines from CD3OH. Appl. Phys. B 44, 111–117 (1987). https://doi.org/10.1007/BF00694203