L
L.L. Lewis
Researcher at National Institute of Standards and Technology
Publications - 5
Citations - 213
L.L. Lewis is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Hyperfine structure & Laser. The author has an hindex of 3, co-authored 5 publications receiving 204 citations.
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Journal ArticleDOI
Shift of S 1 2 2 hyperfine splittings due to blackbody radiation
TL;DR: In this article, the frequency shifts of hyperfine splittings of the ground states of hydrogen and the alkali atoms were estimated from the dc hyperfine Stark shifts, which have previously been measured in the ground state of hydrogen, and were shown to be significant in primary Cs atomic beam frequency standards.
Journal ArticleDOI
SHIFT OF 2Sl/2 HYPERFINE SPLITTINGS DUE TO BLACKBODY RADIATION AND ITS INFLUENCE ON FREQUENCY STANDARDS
TL;DR: In this article, the frequency shifts of hyperfine splittings of 2S 1/2 states due to the blackbody electric field were calculated using the Bates-Damgaard method and the Fermi-Segre formula.
Journal ArticleDOI
Impact of lasers on primary frequency standards and precision spectroscopy
TL;DR: The U.S. primary frequency standard, NBS-6, is a cesium atomicbeam apparatus with an interaction length of 3.74 meters as discussed by the authors, and the experimental uncertainty that limits its accuracy is the microwave cavity phase shift.
Proceedings ArticleDOI
Preliminary Investigation of a New Optically Pumped Atomic Rubidium Standard
TL;DR: Feldman et al. as discussed by the authors used a beam device to detect the presence of gas in the air, and used it as a source of radiation for the first time in the early 1970s.
Journal ArticleDOI
Design considerations and performance of nbs-6, the nbs primary frequency standard
TL;DR: The performance of NBS-6, the U.S. cesium primary frequency standard, has been evaluated by the National Bureau of Standards (NBS).