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Spectroscopy of the Lasing CH3OH Molecule

The development of infrared lasers has had a significant impact on the study of vibrationally excited molecules. As a logical extrapolation of well known techniques, low power diode lasers are used instead of wideband sources and monochromators to provide absorption spectra with doppler limited resolution. The use of fixed frequency, medium and high power gas lasers relies on accidental near coincidences with particular absorption lines, which can be studied in great detail. One such technique is laser stark spectroscopy, where an electric field tunes the various M-components of the infrared transition into exact resonance with the laser, and where the use of a saturating beam and a counter propagating probe beam allows the resolution to go orders of magnitude beyond the doppler limit.