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24 April 2024

» arxiv » physics/0311128

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Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants
M. Fischer ; N.Kolachevsky ; M. Zimmermann ; R. Holzwarth ; Th. Udem ; T.W. Hänsch ; M. Abgrall ; J. Grünert ; I. Maksimovic ; S. Bize ; H. Marion ; F. Pereira Dos Santos ; P. Lemonde ; G. Santarelli ; P. Laurent ; A. Clairon ; C. Salomon ;
Date:	26 Nov 2003
Subject:	Atomic Physics \| physics.atom-ph
Abstract:	In 2003 we have measured the absolute frequency of the $(1S, F=1, m_F=pm 1) leftrightarrow (2S, F’=1, m_F’=pm 1)$ two-photon transition in atomic hydrogen. We observed a variation of $(-29pm 57)$ Hz over a 44 months interval separating this measurement from the previous one performed in 1999. We have combined this result with recently published results of optical transition frequency measurement in the $^{199}$Hg$^+$ ion and and comparison between clocks based on $^{87}$Rb and $^{133}$Cs. From this combination we deduce the stringent limits for fractional time variation of the fine structure constant $partial/{partial t}(ln alpha)=(-0.9pm 4.2) imes 10^{-15}$ yr$^{-1}$ and for the ratio of $^{87}$Rb and $^{133}$Cs spin magnetic moments $partial/{partial t}(ln[mu_{ m {Rb}}/mu_{ m {Cs}}])=(0.5pm 2.1) imes 10^{-15}$ yr$^{-1}$. This is the first precise restriction for the fractional time variation of $alpha$ made without assumptions about the relative drifts of the constants of electromagnetic, strong and weak interactions.
Source:	arXiv, physics/0311128
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