Abstract

The transmission spectra of two CO isotopic variants, i.e., CO12 and CO13, are measured with a recently developed widely tunable THz source. The pure rotational transition lines of J=67, 1011, 1112, 1213, and 1314 have been identified in the spectra. The transition frequencies and the rotational constant of each CO isotopic variant are also presented. Experimental results indicate that the difference of the rotational constants between the two isotopic variants can be used to reliably differentiate CO12 and CO13. Compared with the measurements made by using a Fourier transform infrared spectrometer, our tunable THz source has produced approximately the same accuracies for measuring transition frequencies or determining rotational constants.

© 2007 Optical Society of America

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