The Raman Spectra of the Isotopic Molecules H2, HD, and D2

摘要

The Raman spectra of H2, HD and D2gases, at 3 atmospheres pressure, were excited by Hg 2537 and photographed with a high dispersion quartz prism spectrograph. A total of 42 lines were analyzed. The positions of the pure rotation lines for H2agree with the measurements of Rasetti but the lines in theQvibration band do not. New vibrational constants calculated from the Raman and emission spectrum data of H2and HD give calculated values of the positions of the rotational‐vibration Raman lines in good agreement with the values observed for the three isotopic molecules. Contrary to the theoretical predictions, the 0,0 line of theQvibrational band of HD was observed. A source of error in Raman measurements, namely, the movement of the spectrum due to variations of the barometric pressure during the exposure of a plate, was detected and eliminated.