Low-Frequency Raman Spectra of Nitric Acid Hydrates

Raman spectra of solid nitric acid hydrates (NAM, α- and β-NAD, α- and β-NAT, and NAP) are obtained in the low-frequency region 20−175 cm-1 where phonon bands show characteristic patterns. This fingerprint information, intimately related to the structure and symmetry of the unit cell, is well suited...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2006-01, Vol.110 (1), p.171-176
Main Authors: Grothe, Hinrich, Lund Myhre, Cathrine E, Nielsen, Claus J
Format: Article
Language:English
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Summary:Raman spectra of solid nitric acid hydrates (NAM, α- and β-NAD, α- and β-NAT, and NAP) are obtained in the low-frequency region 20−175 cm-1 where phonon bands show characteristic patterns. This fingerprint information, intimately related to the structure and symmetry of the unit cell, is well suited for observation of phase changes in solid nitric acid hydrates and allows the distinction of mixtures of different hydrate phases. The low-frequency spectra are correlated with the spectra of the respective symmetric NO stretching vibration (1000−1080 cm-1), with literature data, and with X-ray diffraction patterns.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp055521t