Measuring the fine structure constant using helium fine structure

The fine structure of the 2/sup 3/S-2/sup 3/P transition in helium has been precisely measured using laser excitation of an atomic beam. The results give /spl alpha//sup -1/=137.035 853 (3) (7) (99). The three values of standard deviation are from the uncertainty in the measured atomic frequency int...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1995-04, Vol.44 (2), p.518-521
Main Authors: Shiner, D.L., Dixson, R.
Format: Article
Language:English
Subjects:
Atom lasers
Atomic and molecular beam sources and techniques
Atomic and molecular physics
Atomic beams
Atomic measurements
Atomic properties and interactions with photons
Exact sciences and technology
Fine and hyperfine structure
Frequency measurement
Helium
Laser excitation
Laser theory
Laser transitions
Measurement standards
Measurement uncertainty
Mechanical control of atoms, molecules and ions
Physics
Properties of atoms and atomic ions
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Summary:The fine structure of the 2/sup 3/S-2/sup 3/P transition in helium has been precisely measured using laser excitation of an atomic beam. The results give /spl alpha//sup -1/=137.035 853 (3) (7) (99). The three values of standard deviation are from the uncertainty in the measured atomic frequency interval, the total experimental error (including the frequency calibration), and helium theory (1978 value), respectively.< >
ISSN:0018-9456
1557-9662
DOI:10.1109/19.377896