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A082726
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Continued fraction expansion of current estimate of the fine-structure constant alpha.
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2
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OFFSET
| 0,2
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COMMENTS
| The estimate is continually changing.
The term a(7) is today known to be in between 15 and 17, but most likely equal to 16.
The value refers to the zero-energy limit of the coupling constant. At higher energies the value increases; e.g. at the energy 90 GeV of the Z-boson, it is about 1/128.
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LINKS
| Wikipedia, Fine-structure constant.
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FORMULA
| alpha = e^2*c*mu/2h, where e ~ 1.602e-19 is the elementary charge, c = 299792458 m/s the speed of light, mu = pi*4e-7 H/m the vacuum permeability, and h ~ 6.626e-34 Planck's constant.
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EXAMPLE
| alpha = 0.007 297 352 5698(24) = 1 / 137.035 999 074(44), where values in parentheses indicate uncertainty in the last 2 digits.
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CROSSREFS
| Cf. A005600.
Sequence in context: A001330 A091510 A134885 * A189998 A138358 A138329
Adjacent sequences: A082723 A082724 A082725 * A082727 A082728 A082729
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KEYWORD
| nonn,cofr,hard,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 21 2003
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EXTENSIONS
| Value of a(7) corrected by M. F. Hasler (oeis-2011(AT)hasler.fr), Oct 23 2011
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