QUADRUPOLE SPECTRUM OF MOLECULAR HYDROGEN.
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Date
1965
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Ohio State University
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. Measurement were made on line frequencies, line widths and line intensities. The line 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. This data together with measurements by Stoicheff on the rotational Raman frequencies and Herzberg on the 2-0 and 3-0 quadrupole bands was used to obtain precise molecular constants of the first four vibrational states. Observation of the line profile of the S(1) 1-0 line shows that the line has a half width narrower than the expected Doppler width, and is therefore collision narrowed. Intensity measurements on the lines of the 1-0 band and the S(1) line of the 2-0 and 3-0 bands were made because of the astrophysical interest in hydrogen. These measurements were corrected by means of an empirical curve of growth.
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Author Institution: Physics Department, The Pennsylvania State University