Abstract
A spectroscopic method is developed in which the frequency of microwave radiation is added to or subtracted from that of infrared radiation by using two-photon processes in molecules. By utilizing many lines of the C${\mathrm{O}}_{2}$ and ${\mathrm{N}}_{2}$O lasers, this method enables us to perform systematic high-resolution spectroscopy in the 10-\ensuremath{\mu}m region. Both straightforward two-photon absorption spectroscopy and two-photon Lamb-dip spectroscopy can be used. We describe the theory of this method and its application to the observation of the ${\ensuremath{\nu}}_{2}$ band of $^{14}\mathrm{N}$${\mathrm{H}}_{3}$ and $^{15}\mathrm{N}$${\mathrm{H}}_{3}$.
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