Kenneth A. Goettel

Elimination of pressure-induced fluorescence in diamond anvils

At pressures above one megabar (100 GPa) in high‐pressure diamond anvil cell experiments the ruby fluorescence signal needed for pressure calibration is increasingly difficult to measure. A primary cause of this difficulty is the presence of an intense pressure‐induced diamond fluorescence. We give a tentative identification of this pressure‐induced fluorescence and report on a technique for the elimination of this fluorescence. We demonstrate that weak ruby signals, completely hidden by diamond fluorescence, are now easily measured with our technique.At pressures above one megabar (100 GPa) in high‐pressure diamond anvil cell experiments the ruby fluorescence signal needed for pressure calibration is increasingly difficult to measure. A primary cause of this difficulty is the presence of an intense pressure‐induced diamond fluorescence. We give a tentative identification of this pressure‐induced fluorescence and report on a technique for the elimination of this fluorescence. We demonstrate that weak ruby signals, completely hidden by diamond fluorescence, are now easily measured with our technique.

The stability of a sample in a diamond anvil cell

We have performed a theoretical analysis of the stability of a gasketed sample in a diamond anvil cell. Our analysis shows the stability of the sample depends principally on the yield strength and the thickness of the gasket, the bulk modulus and the radius of the sample, and the geometry of the culet. Our results yield a simple methodology that can be used to obtain stable samples in a diamond anvil cell.