The stimulated emission from formic acid molecules was observed for the first time in the submillimeter range. The pumping source was a frequency-tunable CO 2 laser. The cw power of the submillimeter radiation ranged from tens of microwatts to several milliwatts when the pumping power was up to 7 W. The stimulated emission was observed at 22 wavelengths ranging from 250 to 750 μ.
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Dyubko et al. (1974) studied this question.