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Diamond anvil cell 2026-10-18
A diamond anvil cell compresses a sample between opposed diamond tips. The flat diamond anvil culets load a metal gasket whose hole holds the specimen and a pressure-transmitting medium. Transparent diamond admits excitation and returning fluorescence, enabling an internal ruby pressure sensor.[ref]
High Pressure X-Ray Crystallography With the Diamond Cell at NIST⁄NBS by Gasper J. Piermarini. Sections 2–3, Figures 1 and 5: anvils, optical path and gasket
Diamond anvil cell: compression, optical access and internal ruby readout
. Original functional section, not a reconstruction or a scale drawing. The separate excitation and collection paths depict one possible arrangement. A monochromator and photodetector resolve the fluorescence emission spectrum; the inference uses a spectral line position rather than its brightness. The optional sodium chloride reference belongs to the calibration experiment, rather than to every subsequent sample measurement. Details.
The functions in the drawing answer different questions. The drive applies force, the gasket confines the sample, the medium transmits stress, and the ruby pressure scale assigns a local pressure from an optical signal. A large drive reading cannot establish either the sample's pressure or the absence of deviatoric stress. Optical access also permits repeated readings without unloading the sample: a change during a long measurement can be detected rather than silently folded into a material-property curve.
Gasket 2026-10-18