Abstract
IN recent years there has been much interest in the detection of the radio-frequency spectra of interstellar molecules. The observed spectra of the molecules OH and CH corresponded to transitions between the Λ-doubling components of the lower rotational levels. While experimental determinations proved very difficult, theoretical calculations on the Λ-doubling in the lowest rotational level of CH have been notably successful1,2. If the radioastronomical observation3 is corrected for the epicentre and the calculated value for centrifugal distortion, then the agreement of theory and experiment for the radio-astronomical frequency is within 2 MHz in over 3,000 MHz.
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WILSON, I., RICHARDS, W. A-type doubling in SiH molecule. Nature 258, 133–134 (1975). https://doi.org/10.1038/258133a0
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DOI: https://doi.org/10.1038/258133a0
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