Premium
Studies by UV and IR Absorption of Particular Motions of NO 2 − in Single Crystals of NaNO 2
Author(s) -
Jumeau D.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221060118
Subject(s) - polarization (electrochemistry) , absorption (acoustics) , phonon , absorption spectroscopy , materials science , infrared , optics , molecular physics , atomic physics , condensed matter physics , physics , chemistry
The polarization states of the ν 2 IR absorption band of NO 2 −(ν 2 ≈ 828 cm −1 at 20 °C) and of the zero‐phonon line ν 00 of the UV electronic transition of NO 2 −(ν 00 ≈ 385 nm at 10 K), are studied between 10 and 300 K. When the temperature increases, the ν 2 (‖ b ) and ν 00 (‖ a ) absorption lines are no longer perfectly polarized along the b ‐and a ‐axes, respectively, and this depolarization is strongly dependent on the orientation of the wave vector q of the incident light ( q ‖ a , b or c ). This result may be explained by the NO 2 −interaction with low‐frequency waves.