Laser Stark saturation spectroscopy in methyl alcohol

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The method of Lamb dip spectroscopy in Stark tuned molecular gases is discussed and applied to the experimental assignment of methyl alcohol infrared transitions in the υ5 C−O stretch band. Theoretical expressions for Stark Lamb dip patterns are derived for P, Q and R-branch transitions. Stark tuning results and transition quantum number assignments are presented for several 10μm transitions, along with measured values of resonant frequencies, absorption coefficients and pressure broadening coefficients.

Work supported by the Army Research Office, Durham, and the National Science Foundation.