Optical Frequency Measurement is Getting a Lot More Precise
作者:
Bertram Schwarzschild,
期刊:
Physics Today
(AIP Available online 1997)
卷期:
Volume 50,
issue 12
页码: 19-21
ISSN:0031-9228
年代: 1997
DOI:10.1063/1.881627
出版商: AIP
数据来源: AIP
摘要:
At the Max Planck Institute for Quantum Optics in the Munich suburb of Garching, Theodor Hansch and colleagues have measured the ultraviolet transition frequency between the 1S and 2S states of atomic hydrogen to be2.466 061 413 187 34(84)×1015 Hz.With an uncertainty of only 3 parts in1013,this result exceeds the accuracy of the best previous measurement of the 1S‐2S transition by two orders of magnitude. It is, in fact, the most accurate measurement to date of any frequency in the visible or ultraviolet. It's so accurate that simply repeating the measurement a year from now would provide a better and more direct verification (or falsification) of the constancy of the fine‐structure constant over cosmological time than any astrophysical data we have.
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