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Science 13 June 1986:
Vol. 232. no. 4756, pp. 1404 - 1406
DOI: 10.1126/science.232.4756.1404
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Articles

High-Pressure Ruby and Diamond Fluorescence: Observations at 0.21 to 0.55 Terapascal

J. A. XU 1, H. K. MAO 1, and P. M. BELL 1

1 Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20008.

A diamond-anvil, high-pressure apparatus was used to extend the upper pressure limit of static laboratory experiments. Shifts of the R1 strong fluorescent line of ruby were observed that correspond to static pressures of 0.21 to 0.55 terapascal (2.1 to 5.5 megabars) at 25°C. Sensitive spectroscopic techniques in the pressure range 0.15 to 0.28 terapascal were used to observe ruby and diamond fluorescence separately; these two fluorescent emissions overlap strongly at high pressures. At pressures greater than approximately 0.28 terapascal, the diamond fluorescence diminished and the ruby fluorescence reappeared strongly. Pressure was determined by extrapolation of the calibrated shift of the ruby R1 line.

Submitted on February 19, 1986
Accepted on April 8, 1986


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