Precision Atomic Spectroscopy for Improved Limits on Variation of the Fine Structure Constant and Local Position Invariance

Published

February 16, 2007

Author(s)

Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Neil Ashby, Luca Lorini, Windell Oskay, Marie Delaney, James C. Bergquist, Steven R. Jefferts, Thomas E. Parker, Thomas P. Heavner, Filippo Levi, Jon H. Shirley, Wayne M. Itano, Kyoungsik Kim, Leo W. Hollberg

Abstract

We report tests of local position invariance (LPI) and the constancy of fundamental constants from measurements of the frequency ratio of the 282-nm $^{199}$Hg$^+$ optical clock transition to the ground state hyperfine splitting in $^{133}$Cs. Analysis of the frequency ratio, extending over six years at NIST, is used to place a limit on the fractional variation of the two clocks of $

Citation

Physical Review Letters

Volume

98

Issue

070801

Pub Type

Journals

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Keywords

frequency ratios, optical frequency metrology, variation of fundamental constants

Citation

Fortier, T. , Stalnaker, J. , Diddams, S. , Ashby, N. , Lorini, L. , Oskay, W. , Delaney, M. , Bergquist, J. , Jefferts, S. , Parker, T. , Heavner, T. , Levi, F. , Shirley, J. , Itano, W. , Kim, K. and Hollberg, L. (2007), Precision Atomic Spectroscopy for Improved Limits on Variation of the Fine Structure Constant and Local Position Invariance, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50426 (Accessed October 17, 2025)