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Title: Polarizability of Helium and Gas Metrology

Abstract

Using a quasispherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A{sub {epsilon}} in the limit of zero density. We obtained (A{sub {epsilon}}{sub ,meas}-A{sub {epsilon}}{sub ,theory})/A{sub {epsilon}}=(-1.8{+-}9.1)x10= {sup -6}, where the standard uncertainty (9.1 ppm) is a factor of 3.3 smaller than that of the best previous measurement. If the theoretical value of A{sub {epsilon}} is accepted, these data determine a value for the Boltzmann constant that is only 1.8{+-}9.1 ppm larger than the accepted value. Our techniques will enable a helium-based pressure standard and measurements of thermodynamic temperatures.

Authors:
;  [1];  [2];  [3]
  1. Process Measurements Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8360 (United States)
  2. Istituto Nazionale di Ricerca Metrologica, Turin 10135 (Italy)
  3. School of Oil and Gas Engineering, University of Western Australia, Perth 6009 (Australia)
Publication Date:
OSTI Identifier:
20953311
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 98; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.98.254504; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CAVITY RESONATORS; HELIUM; MICROWAVE RADIATION; POLARIZABILITY; REFRACTIVE INDEX

Citation Formats

Schmidt, J W, Moldover, M R, Gavioso, R M, and May, E F. Polarizability of Helium and Gas Metrology. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.254504.
Schmidt, J W, Moldover, M R, Gavioso, R M, & May, E F. Polarizability of Helium and Gas Metrology. United States. https://doi.org/10.1103/PHYSREVLETT.98.254504
Schmidt, J W, Moldover, M R, Gavioso, R M, and May, E F. 2007. "Polarizability of Helium and Gas Metrology". United States. https://doi.org/10.1103/PHYSREVLETT.98.254504.
@article{osti_20953311,
title = {Polarizability of Helium and Gas Metrology},
author = {Schmidt, J W and Moldover, M R and Gavioso, R M and May, E F},
abstractNote = {Using a quasispherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A{sub {epsilon}} in the limit of zero density. We obtained (A{sub {epsilon}}{sub ,meas}-A{sub {epsilon}}{sub ,theory})/A{sub {epsilon}}=(-1.8{+-}9.1)x10= {sup -6}, where the standard uncertainty (9.1 ppm) is a factor of 3.3 smaller than that of the best previous measurement. If the theoretical value of A{sub {epsilon}} is accepted, these data determine a value for the Boltzmann constant that is only 1.8{+-}9.1 ppm larger than the accepted value. Our techniques will enable a helium-based pressure standard and measurements of thermodynamic temperatures.},
doi = {10.1103/PHYSREVLETT.98.254504},
url = {https://www.osti.gov/biblio/20953311}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 25,
volume = 98,
place = {United States},
year = {Fri Jun 22 00:00:00 EDT 2007},
month = {Fri Jun 22 00:00:00 EDT 2007}
}