Summary
We describe a synchrotron infrared facility for high-pressure spectroscopy and microspectroscopy at the National Synchrotron Light Source (NSLS). Located at beamline U2B on the VUV ring of the NSLS, the facility utilizes a commercial FT-IR together with custom-built microscope optics designed for a variety of diamond anvil cell experiments, including low- and high-temperature studies. The system contains an integrated laser optical/grating spectrometer for concurrent optical experiments. The facility has been used to characterize a growing number of materials to ultrahigh pressure and has been instrumental in the identification of new high-pressure phenomena. Experiments on dense hydrogen to > 200 GPa have led to the discovery of numerous unexpected properties of this fundamental system. The theoretically predicted molecular-atomic transition of H2O ice to the symmetric hydrogen-bonded structure has been identified, and new classes of high-density clathrates and molecular compounds have been characterized. Experiments on natural and synthetic mineral samples have been performed to study hydrogen speciation, phase transformations, and microscopic inclusions in multiphase assemblages. Detailed information on the behavior of new materials, including novel high-pressure glasses and ceramics, has also been obtained.
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Paper written for the 3rd Workshop on “Development of Infrared Synchrotron Radiation and Applications to Materials Science”, Orsay, 27–28March 1997.
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Hemley, R.J., Goncharov, A.F., Lu, R. et al. High-pressure synchrotron infrared spectroscopy at the national synchrotron light source. Nouv Cim D 20, 539–551 (1998). https://doi.org/10.1007/BF03185547
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DOI: https://doi.org/10.1007/BF03185547