A method of microwave spectroscopy using three-level maser action is described, and some preliminary experiment on HDCO is given. A b -type transition, 3 03 ←2 12 , which is connected with a a -type transition 2 11 ←2 12 , has been definitely assigned by the observation of three-level master action. Moreover, the weak transition, 3 03 ←2 12 , was observed with very good signal to noise ratio by using the strong transition, 2 11 ←2 12 , as a detecting transition. Theories of the three-level maser action in gases are also compared with experiment and shown to be in good agreement. Further applications of the three-level gas maser as a spectrometer as well as an amplifier are discussed.
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Yajima et al. (1960) studied this question.
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