More then 2600 new lines have been measured in the emission spectra of H2 and D2 between 1.15 and 1.97 μ, with lead sulfide cells and powerful discharge tubes. Most of the strong lines below 1.65 μ belong to known band systems. Beyond this, new and so far incompletely analyzed band systems become prominent.
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Notes to Tables I–IV. The calculated wave numbers are obtained from the energy levels derived from bands in the photographic infrared. Where no calculated value is given one or both of the levels involved were not previously known. The intensities of the weaker lines are only very rough values because of the general background. The atmospheric water vapor absorption accounts for some anomalous intensities and a few missing lines. Where no observed intensities are listed in the 2→3 band of Table III, the recorder went off scale in all traces so that the intensities could not be measured.
Notes to Tables I–IV. The calculated wave numbers are obtained from the energy levels derived from bands in the photographic infrared. Where no calculated value is given one or both of the levels involved were not previously known. The intensities of the weaker lines are only very rough values because of the general background. The atmospheric water vapor absorption accounts for some anomalous intensities and a few missing lines. Where no observed intensities are listed in the 2→3 band of Table III, the recorder went off scale in all traces so that the intensities could not be measured.