NDLI: High-accuracy frequency standards using laser-cooled Hg/sup +/ ions

Content Provider	IEEE Xplore Digital Library
Author	Berkeland, D.J. Miller, J.D. Bergquist, J.C. Itano, W.M. Wineland, D.J.
Copyright Year	1998
Description	Author affiliation: Nat. Inst. of Stand. & Technol., Boulder, CO, USA (Berkeland, D.J.)
Abstract	We discuss frequency standards based on laser-cooled /sup 199/Hg/sup +/ ions confined in cryogenic rf (Paul) traps. In one experiment, the frequency of a microwave source is servoed to the ions' ground-state hyperfine transition at 40.5 GHz. For seven ions and a Ramsey free precession time of 100 s, the fractional frequency stability is 3.3 (2)/spl times/10/sup -13/ /spl tau//sup -1/2/ for measurement times /spl tau/<2 h. The ground-state hyperfine interval is measured to be 40 507 347 996.841 59 (14) (41) Hz, where the first number in parentheses is the uncertainty due to statistics and systematic errors, and the second is the uncertainty in the frequency of the international time scale to which the standard is compared. In a second experiment under development, a strong-binding cryogenic trap will confine a single ion for use in an optical frequency standard based on a narrow electric quadrupole transition at 282 nm.
Starting Page	32
Ending Page	36
File Size	380848
Page Count	5
File Format	PDF
ISBN	0780343735
ISSN	10756787
DOI	10.1109/FREQ.1998.717875
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-29
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Mercury (metals) Laser transitions Masers Cryogenics Frequency measurement Time measurement Stability Error analysis Measurement standards Charge carrier processes
Content Type	Text
Resource Type	Article

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