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Pressure dependence of TCNQ Raman spectrum at 25 K

โœ Scribed by S. Desgreniers; C. Carlone; H.D. Hochheimer

Book ID
103891169
Publisher
Elsevier Science
Year
1986
Weight
196 KB
Volume
139-140
Category
Article
ISSN
0378-4363

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โœฆ Synopsis

The 514.5 nm laser excitation was used to excite the Raman spectrum of TCNQ crystals at 25 K. Using the diamond anvil cell and liquid argon as a pressure medium, the Raman spectrum was followed from 0 to 2.0 GPa. We find that the Gruneisen parameter is quite constant for the low frequency modes and that it drops by order of magnitude for the high frequency modes; TCNQ is a well behaved molecular crystal at 25 K. At 300 K, the Gruneisen parameter is a monotonically decreasing function of the frequency, indicating a hierarchy of forces. In going from 25 K to 300 K, the effect of phonon-phonon interaction offsets that of volume dilatation.

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Raman spectrum of NH4ReO4 at high pressu
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โœ D. D. Klug; P. G. Sim; R. J. C. Brown ๐Ÿ“‚ Article ๐Ÿ“… 1982 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 255 KB

The pressure dependences at room temperature of the translational lattice modes and of the u2 and u., internal bending modes of the ReO; ion in solid NH,ReO, are reported. There is no evidence of any phase transition up to a pressure of 15 kilobar. The pressure coefficients of the translational mode