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Browse Journals & Magazines > Instrumentation and Measureme ...> Volume:40 Issue:2 Help

A 303-MHz frequency standard based on trapped Be/sup +/ ions

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5 Author(s)
Bollinger, J.J. ; national Institute of Standards and Technology ; Heizen, D.J. ; Itano, W.M. ; Gilbert, S.L.
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A 303-MHz hyperfine transition in the ground state of 9Be+ was used as a basis of a frequency standard. The ions were stored in a Penning ion trap. Linewidths as narrow as 900μHz were obtained. The frequency stability was measured to be better than 3 x 10-12τ-1/2. The inaccuracy in the second-order .Doppler shift was reduced to 5 parts in 1015 by laser cooling. An apparent pressure shift with an unexpectedly large value was discovered which limits the accuracy of the current experiment to approximately 1 part in 1013.

Published in:
Instrumentation and Measurement, IEEE Transactions on  (Volume:40 ,  Issue: 2 )

Date of Publication: April 1991

Page(s):
126 - 128
ISSN :
0018-9456
Digital Object Identifier :
10.1109/TIM.1990.1032897
Product Type:
Journals & Magazines
Date of Current Version :
13 February 2006
Issue Date :
April 1991
Sponsored by :
IEEE Instrumentation and Measurement Society

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