Journal ArticleDOI
Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency
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In this article, the results of a joint experiment aimed primarily at the determination of the frequency of the H1 hyperfine transition (F = 1, mF = 0) was reported.Abstract:
The results of a joint experiment aimed primarily at the determination of the frequency of the H1 hyperfine transition (F = 1, mF = 0) ? (F = 0, mF = 0) is reported. In terms of the frequency of the Cs133 hyperfine transition (F = 4, mF = 0) ?(F = 3, mF = 0), defined as 9192 631 770 Hz, for the unperturbed hydrogen transition frequency the value ?H = 1420 405 751.768 Hz is obtained. This result is the mean of two independent evaluations against the same cesium reference, which differ by 2 × 10-3 Hz. We estimate the one-sigma uncertainty of the value ?H also to be 2 × 10-3 Hz. One evaluation is based on wall-shift experiments at Harvard University; the other is a result of a new wall-shift measurement using many storage bulbs of different sizes at the National Bureau of Standards. The experimental procedures and the applied corrections are described. Results for the wall shift and for the frequency of hydrogen are compared with previously published values, and error limits of the experiments are discussed.read more
Citations
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Accurate frequencies of molecular transitions used in laser stabilization: the 3.39‐μm transition in CH4 and the 9.33‐ and 10.18‐μm transitions in CO2
TL;DR: In this paper, the frequencies of three lasers stabilized to molecular absorptions were measured with an infrared-frequency synthesis chain extending upwards from the cesium frequency standard, and the measured values are 29.442 483 315 (25) THz for the 10.18μm R(30) transition in CO2, 32.134 266 891 (24) THZ for the 9.33μm RCR(10) transition, and 88.376 181 627 (50) THtz for the 3.39μm P(7)-transition
Journal ArticleDOI
The gj factor of a bound electron and the hyperfine structure splitting in hydrogenlike ions
TL;DR: In this article, a comparison between theory and experiment of the hyperfine structure splitting and the electronic g j factor in heavy highly charged ions provides a unique testing ground for quantum electrodynamics in the presence of strong electric and magnetic fields.
Journal ArticleDOI
Some possibilities for laboratory searches for variations of fundamental constants
TL;DR: In this paper, the authors consider different options for the search for possible variations of the fundamental constants in both time and space in the range 1081010 years and give a brief overview of the results obtained with several methods.
Journal ArticleDOI
Recoil effects in the hyperfine structure of QED bound states
TL;DR: In this paper, the authors give a general discussion of the derivation from field theory of a formalism for the perturbative solution of the relativistic two-body problem, which is obtained by fixing the loop energy in the four-dimensional formalism at a point which is independent of the loop momentum and is symmetric in the two particle variables.
Journal ArticleDOI
The fine structure constant
TL;DR: In this paper, the fine structure constant is one of the fundamental constants of nature characterizing the whole range of physics including elementary particle, atomic, mesoscopic and macroscopic systems.
References
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Journal ArticleDOI
Hydrogen-Maser Principles and Techniques
Daniel Kleppner,Howard C. Berg,S. B. Crampton,Norman F. Ramsey,Robert F. C. Vessot,H. E. Peters,Jacques Vanier +6 more
TL;DR: In this article, the maser construction and operation design principles emphasizing microwave cavity, low magnetic field, hydrogen storage and maser tuning techniques are discussed. But the masers are not discussed in detail.
Journal ArticleDOI
Hyperfine Separation of Ground-State Atomic Hydrogen
TL;DR: In this paper, the hyperfine separation of hydrogen in its ground state was determined by means of the hydrogen maser, and two masers were operated simultaneously for purposes of tuning, checking internal consistency, and measuring the wall shift.
Journal ArticleDOI
An Intercomparison of Hydrogen and Cesium Frequency Standards
Robert F. C. Vessot,H. Peters,J. Vanier,R. Beehler,D. Halford,R. Harrach,David W. Allan,D.J. Glaze,C. Snider,J. Barnes,Leonard S. Cutler,L. Bodily +11 more
TL;DR: In this article, a comparison of the average frequency and frequency stability of the HP 5060A cesium beam, two Varian Associates H-10 atomic hydrogen masers, and the United States Frequency Standard NBS III was made.
Journal ArticleDOI
Cesium Beam Atomic Time and Frequency Standards
TL;DR: In this article, a review of the characteristics of cesium beam atomic frequency standards is presented, including the operating principles of CWS, measures of performance, error sources in CWSs, characteristics of several standards in current operation, and comparison of the atomic time standards derived from CWS frequency standards.