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Science 28 July 2006:
Vol. 313. no. 5786, pp. 448 - 449
DOI: 10.1126/science.1131834
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Perspectives

PHYSICS:
A More Precise Fine Structure Constant

Daniel Kleppner

The fine structure constant, a vital quantity in quantum theory, sets the scale for the physical world. Recent measurements have improved its precision by a factor of 10.

The author is in the Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. E-mail: kleppner{at}mit.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)