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The microwave spectra of thiophosphoryl chloride, SPCl 3 , were studied within the frequency region from 2,600 Mc to 2,900 Mc with the cavity spectrometer, of which minimum detectable absorption coefficient was about 5×10 -9 cm -1 . Several absorption lines of the rotational transition of the symmetric and asymmetric top molecules were observed and their temperature effect examined.
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K. Tsukada (1955) studied this question.
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