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Raman study on para nitroaniline single crystal. II: Internal Vibrations
Author(s) -
Harrand M.
Publication year - 1975
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250040107
Subject(s) - fermi resonance , raman spectroscopy , planar , resonance (particle physics) , molecule , crystal (programming language) , chemistry , deuterium , single crystal , line (geometry) , molecular vibration , fermi gamma ray space telescope , molecular physics , crystallography , atomic physics , nuclear magnetic resonance , condensed matter physics , optics , physics , geometry , computer graphics (images) , mathematics , organic chemistry , computer science , programming language
The assignment of the Raman frequencies from 200 to 1800 cm −1 has been made taking into account the values calculated by Brandmüller et al. for a planar molecule since only the H atoms of NH 2 are out of the plane. In the crystal the V NO2 sline is unusually weak and the 1276–1284 cm −1 broad band is extremely strong: its complexity is explained by a Fermi resonance whose development can be followed with temperature variations. On the other hand the line of the deuterated pNA is always sharp because the resonant combination is related to a NH 2 vibration. The observation of this Fermi resonance confirms the non‐planar structure of the molecule in the crystal.