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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Raman spectroscopy of hot compressed hydrogen and nitrogen: implications for the intramolecular potential
Alexander F Goncharov1, Jonathan C Crowhurst
1Lawrence Livermore National Laboratory, University of California, 7000 East Avenue, Livermore, California 94551, USA.
Abstract:
Raman measurements of molecular hydrogen ( and ) and nitrogen () have been made under simultaneous conditions of high temperature and high static pressure. Measurements have been made on H2 and D2 to 50 GPa and 1600 K, and on to 50 GPa and 2000 K. In all three materials the familiar molecular stretching mode (vibron) is accompanied in the high-temperature Raman spectra by one or more lower-frequency peaks due to transitions from excited vibrational states. We find that the frequency differences between these bands decreases with pressure, implying that the anharmonicity of the corresponding part of the intramolecular potential also decreases. This is accompanied by an increase in the measured linewidths of the bands that is consistent with a decrease of the depth of the potential and an approaching molecular dissociation.
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