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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Published on: October 7, 2013

High-pressure ruby and diamond fluorescence: observations at 0.21 to 0.55 terapascal.

J A Xu, H K Mao, P M Bell

    Science (New York, N.Y.)
    |June 13, 1986
    PubMed
    Summary

    Researchers pushed the limits of static high-pressure experiments using a diamond-anvil apparatus. They successfully measured pressures up to 0.55 terapascal, advancing the field of high-pressure science.

    Area of Science:

    • Geophysics
    • Materials Science
    • High-Pressure Physics

    Background:

    • Static laboratory experiments are crucial for understanding material behavior under extreme conditions.
    • Extending the upper pressure limit of these experiments is essential for exploring novel physical phenomena.

    Purpose of the Study:

    • To extend the upper pressure limit of static laboratory experiments.
    • To calibrate pressure measurements at unprecedented static pressures.

    Main Methods:

    • Utilized a diamond-anvil, high-pressure apparatus.
    • Employed sensitive spectroscopic techniques to observe ruby and diamond fluorescence.
    • Monitored shifts of the ruby R(1) fluorescent line for pressure determination.

    Main Results:

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    • Achieved static pressures ranging from 0.21 to 0.55 terapascal (TPa).
    • Observed distinct changes in ruby and diamond fluorescence overlap and intensity at pressures above 0.28 TPa.
    • Successfully extrapolated pressure using the calibrated shift of the ruby R(1) line.

    Conclusions:

    • The diamond-anvil apparatus successfully extended the upper limit of static pressure measurements.
    • Ruby fluorescence remains a viable pressure indicator up to 0.55 TPa.
    • Spectroscopic analysis provides valuable insights into material behavior at extreme pressures.