Abstract
Pressure-induced Raman shifts and line broadening in crystalline anthracene have been studied up to 3.1 GPa at ambient temperature. The use of nitrogen as a hydrostatic pressure medium eliminated pressure-induced defect fluorescence that had previously restricted high-pressure Raman studies of anthracene. Mode Grüneisen parameters have been determined for six phonons and nine vibrons, and some evidence for a previously suggested phase transition at 2.4 ± 0.2 GPa is observed in the line width data. The calibrated pressure-induced spectral shifts and line width changes also can be utilized as a gauge of the pressure and temperature profile of a laser-induced shock front (Hambir, S. A.; Franken, J.; Hare, D. E.; Chronister, E. L.; Baer, B. J.; Dlott, D. D. J. Appl. Phys. 1997, 81, 2157).
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