Raman spectra of shock compressed pentaerythritol tetranitrate single crystals: Anisotropic response

Article Abstract:

Single-pulse Raman spectroscopy is used to examine the response of crystals shocked along the [100] (insensitive) and [110] (sensitive) orientations to gain insight into the anisotropic sensitivity of shocked pentaerythritol tetranitrate (PETN) single crystals. The data in combination with previous static pressure results provide support for conformational changes in PETN molecules for shock compression along the [110] (sensitive) orientation.

United States, All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Pentaerythritol, Usage, Conformational analysis, Raman spectroscopy

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Raman and X-ray scattering of high-pressure phases of urea

Article Abstract:

A series of Raman-scattering measurements on urea in a diamond-anvil cell at room temperature, at pressures up to 12 GPa is reported. It is suggested that the spatial domains consist of regions with varying crystallographic orientations or varying directions of electric polarization.

Science & research, Gem Diamonds, All Other Nonmetallic Mineral Mining, Miscellaneous nonmetallic minerals, Research, Diamonds, Optical properties, Raman effect, Polarization (Electricity), Diamond crystals

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High-pressure effects on fluorescence of anthracene crystals

Article Abstract:

Pressure-induced changes on the fluorescence spectra of anthracene crystals are examined up to 5 GPa. Under hydrostatic pressure, there was no excimer fluorescence from anthracene single crystals.

Cyclic crudes and intermediates, Cyclic Crude and Intermediate Manufacturing, Anthracine, Analysis, Influence, Fluorescence, Anthracene, Materials at high pressures, High pressure effects

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