Ion Trap as a Frequency Standard Measurement of Ba+ HFS Frequency Fluctuations

The 8-GHz "field independent" F = 1, mF = 0 to F = 2, mF = 0 ground level Zeeman transition frequency in 137Ba+ ions has been compared with a commercial Cs beam standard. About 10+ ions were stored in a RF quadrupole trap for several hours and cooled by He buffer gas. Hyperfine pumping was...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1985-06, Vol.IM-34 (2), p.242-245
Main Authors: Knab, Holger, Niebling, Klaus-D., Werth, Gunter
Format: Article
Language:English
Subjects:
Buffer storage
Exact sciences and technology
Fluctuations
Frequency measurement
Laser beams
Laser excitation
Measurement standards
Metrology
Metrology, measurements and laboratory procedures
Optical pulses
Physics
Radio frequency
Tunable circuits and devices
Units and standards
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Summary:The 8-GHz "field independent" F = 1, mF = 0 to F = 2, mF = 0 ground level Zeeman transition frequency in 137Ba+ ions has been compared with a commercial Cs beam standard. About 10+ ions were stored in a RF quadrupole trap for several hours and cooled by He buffer gas. Hyperfine pumping was achieved by a pulsed tunable dye laser and the transition between the Zeeman sublevels was induced by a microwave signal locked to the primary frequency standard. The transition was observed via changes in the ionic fluorescence intensity. The observed frequency fluctuations δv/v of < 2 × 10-12 over a 5-h measurement period are compatible with the specified fluctuations of the reference. Possible sources of frequency shifts were. analyzed and found to be controllable within the precision set by the atomic frequency reference.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.1985.4315314