Abstract

We report on an experimental demonstration of molecular Stark spectroscopy based on the use of tunable far-infrared radiation at 0.91 THz. The radiation was generated by the nonlinear mixing of the radiation from two CO2 lasers in a point-contact metal–insulator–metal diode. The technique is used to make the first reported measurement of the permanent dipole moment of 13CH3OH; μa = 0.883(25) D.

© 1987 Optical Society of America

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