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  • Title: High-pressure physics: the 1-megabar mark on the ruby r1 static pressure scale.
    Author: Mao HK, Bell PM.
    Journal: Science; 1976 Feb 27; 191(4229):851-2. PubMed ID: 17730998.
    Abstract:
    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 R(1) 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.
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