The Infra-Red Radiation of Nitrogen

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Abstract
Extension of the first positive group of nitrogen bands. An investigation of the infra-red portion of the first positive group of nitrogen bands by thermocouple and prism has extended that group to the region of 1.5μ. The broad radiation maxima corresponding to the 0, +1, and +2 sequences have been broken up into individual bands. Their observed maxima occur at the positions calculated from the known vibration levels of this group. For higher accuracy the region from 7500 to 10500A was photographed under a dispersion of 9A per mm with neocyanin plates. The bands were recorded as far as 10500, the beginning of the 0 sequence. The measurements of the heads and principal lines within this range are given in tables. From these results values for the bands of the 0 sequence are found, and those of the -1 and -2 sequences are improved.

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