Absolute Far-Infrared Absorption Intensities of α-Nitrogen
Robert V. St. LouisDepartment of Chemistry, University of Southern California, Los Angeles, California 90007O. SchneppDepartment of Chemistry, University of Southern California, Los Angeles, California 90007
1969en
ABI
Abstract
The absolute intensities of the translational lattice mode absorptions of α-N2 in the far infrared have been measured. The experimental values are smaller by a factor of 5 than the calculated intensities obtained from a quadrupole-induced mechanism theory. This discrepancy is discussed in terms of the model on which the theory was based. The intensity of the 50-cm−1 line was found to be temperature dependent and decreased gradually between 15°K and 35°K. No discrete absorption was observed for the β phase above 36°K. The 50-cm−1 line has a width smaller than 0.5 cm−1 and the 70-cm−1 line has a width of 6 cm−1. Evidence was found for a decrease of the frequency of the 50-cm−1 line as the phase transition temperature is approached.
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