Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
104 (1996), S. 4365-4370
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The analysis of the far infrared spectrum of thin high quality α-N2 single crystals as a function of temperature was carried out by high resolution Fourier-transform infrared spectroscopy. The bandwidths at T=8 K of the two translational modes, correlated to the two-phonon density of states, are considerably smaller than the Raman active modes. This result can be interpreted on the basis of a lower anharmonicity of the translations with respect to the librational modes. The α-N2 is the first molecular crystal where such difference is found. The evolution of the T(1)u linewidth was studied until the α-β phase transition. The relaxation of this mode is essentially dominated by fourth-order decay processes. The study of the frequency shifts of both infrared phonons allowed the contributions relative to different orders of the anharmonic potential to be separated. Finally a careful analysis of the relative intensities of the two phonons was carried out in the α phase. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.471187
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