The infrared spectrum of the nitrate ion in various crystalline environments
Institution: | Oregon State University |
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Department: | Chemistry |
Degree: | MS |
Year: | 1964 |
Keywords: | Nitrates |
Record ID: | 1515439 |
Full text PDF: | http://hdl.handle.net/1957/48060 |
The infrared absorption spectra in the out-of-plane bending (v₂) region of potassium nitrate were studied for three phases. Several types of sampled were used: nujol mulls, fused samples, and N¹⁴-N¹⁵ isotopic mixtures. The existence of three of the reported polymorphic phases was confirmed by the spectra. The transitions between phase II and phase I and between phase III and phase II were followed spectroscopically. The effects of dipole-dipole interactions between nearest neighbors were observed. The out-of-plane bending mode (v₂) and the antisymmetric stretching mode (v₃) were studied for nitrate ion in various alkali halide lattices. The two expected effects were observed. These effects were the narrowing of bands due to complete absence of coupling, and a lowering of absorption frequencies when the lattice constant of the host matrix was increased.