Abstract
The quadrupole spectrum of molecular hydrogen has been investigated with spectroscopic instruments of high resolution and a large 44-meter multiple reflection absorption cell. The frequencies of seven lines in the 1-0 band and two lines in the 2-0 band were measured. Pressure shifts were obtained for five lines in the 1-0 band. These data were used to obtain precise molecular constants for the first few vibrational states. Intensity measurements on the lines of the 1-0 and 2-0 bands and the S(1) line of the 3-0 band were made and corrected by means of an empirical curve of growth. These measurements are compared with theoretical calculations of the hydrogen quadrupole matrix element.
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