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Science 27 February 1976:
Vol. 191. no. 4229, pp. 851 - 852
DOI: 10.1126/science.191.4229.851
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Articles

High-Pressure Physics: The 1-Megabar Mark on the Ruby R1 Static Pressure Scale

H. K. MAO 1 and P. M. BELL 1

1 Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008

Ruby crystals were subjected to a static pressure greater than 1 megabar in a diamond-windowed pressure cell. The pressure was monitored continuously by observing the spectral shift of the sharp fluorescent R1 ruby line excited with a cadmium-helium gas-diffusion laser beam. One megabar appears to be the highest pressure ever reported for a static experiment in which an internal calibration was employed.

Submitted on December 29, 1975
Revised on January 8, 1976


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