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Review Article: Quantum-based vacuum metrology at the National Institute of Standards and Technology
Julia Scherschligt, James A. Fedchak, Zeeshan Ahmed, Daniel S. Barker, Kevin Douglass, Stephen Eckel, Edward Hanson, Jay Hendricks, Nikolai Klimov, Thomas Purdy, Jacob Ricker, Robinjeet Singh, Jack Stone
National Institute of Standards and Technology, 100 Bureau Dr. Gaithersburg, Maryland 20899

Published: 01 July 2018 by American Vacuum Society in Journal of Vacuum Science & Technology A
American Vacuum Society, Volume 36; 10.1116/1.5033568
Abstract: The measurement science in realizing and disseminating the unit for pressure in the International System of Units, the pascal (Pa), has been the subject of much interest at the National Institute of Standards and Technology (NIST). Modern optical-based techniques for pascal metrology have been investigated, including multiphoton ionization and cavity ringdown spectroscopy. Work is ongoing to recast the pascal in terms of quantum properties and fundamental constants and in doing so make vacuum metrology consistent with the global trend toward quantum-based metrology. NIST has ongoing projects that interrogate the index of refraction of a gas using an optical cavity for low vacuum, and count background particles in high vacuum to extreme high vacuum using trapped laser-cooled atoms.
Keywords: optical, Metrology, Extreme, cavity, Pascal, NIST, high vacuum, Quantum Based
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