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Physics Express 2011, 1: 24
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Research Article
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Raman spectroscopic study of 2,4,6–trinitrotoluene at high pressure
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Sergei V. Goryainova,b,*, Vladimir A. Volodinb,c, Andrey M. Danilenkod
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a Institute of Mineralogy and Petrography SB RAS, Acad. Koptyug Avenue 3, Novosibirsk 630090, Russia
bNovosibirsk State University, Pirogova street 2, Novosibirsk 630090, Russia
c Institute of Semiconductor Physics SB RAS, Acad. Lavrentiev Avenue 13, Novosibirsk 630090, Russia
dInstitute of Inorganic Chemistry SB RAS, Acad. Lavrentiev Avenue 3, Novosibirsk 630090, Russia
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Abstract |
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By means of Raman spectroscopy, monoclinic 2,4,6–trinitrotoluene (TNT) samples were investigated at elevated hydrostatic pressures up to ~3 GPa. As pressure was increased to 2 GPa, new bands emerged in the low-frequency portion of measured Raman spectra of the samples while some of the Raman bands initially present in the spectra disappeared from them, proving conclusively that a structural transition from initially monoclinic phase-I to phase-II TNT occurred in our samples. The majority of high-frequency bands (with wavenumbers above 250 cm-1) were found to show a sharp increase in intensity at the transition pressure of 2 GPa. The frequencies of several low-frequency bands in phase-I TNT samples exhibited a nonlinear dependence on pressure; this anharmonic behavior of related vibration modes was attributed to very weak van der Waals forces acting between TNT molecules.
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Keywords |
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Trinitrotoluene; Organic crystal; Raman scattering; High pressure
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