Abstract
SOME time ago the critical potentials in nitrogen were determined by the present writer (Zeit. f. Phys., 34, 622, 1925) by measuring the excitation potentials of the o-o band of the second positive group and of the negative bands. The results were 13.0 and 19.6 volts respectively. Having the absolute value of 13.0 volts, and using the term scheme of N2 given by R. T. Birge (Phys. Rev., 23, 294, 1924), the excitation potentials of the first and fourth positive groups of nitrogen could be calculated, and a value of 8 volts was obtained for the resonance potential, as was predicted by R. T. Birge (NATURE, 114, 642, 1924). The band system belonging to the transition between the first excited and the normal state was, however, not known. In order to settle the question about the normal state of the nitrogen molecule, absorption plates have been taken. It is extremely difficult to get the right conditions for this experiment. The final pictures were taken with the vacuum spectrograph of Prof. J. J. Hopfield, which he kindly offered to me for that purpose.
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SPONER, H. Absorption Bands in Nitrogen. Nature 118, 696 (1926). https://doi.org/10.1038/118696a0
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DOI: https://doi.org/10.1038/118696a0
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