Since 1959, when the diamond anvil cell (DAC) was developed by researchers at the National Bureau of Standards, it has been possible to conveniently study materials at high pressures in the mid-infrared (MIR) region by infrared spectroscopy. The technique has subsequently been extended to the far-infrared (FIR) region, and at present, applications of the DAC extend from the edge of the ultraviolet region to the far-infrared. Because of its compact size, the DAC can readily fit into the sample compartment of a variety of infrared spectrophotometers (dispersive and interferometric), and a number of unique investigations have been possible. Further, with the advent of the laser, Raman scattering experiments at high pressures also became possible with the DAC. Recently, an advanced generation of the DAC called the ultra-high-pressure DAC has been used in visible and Raman studies into the megabar region.
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