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Bohr radius

Atomic fundamental physical constant used as atomic unit of length:
a 0 = 4 π ɛ 0 ℏ 2 m e e 2 = 5.291 772 49 24 × 10 −11 m
where e the elementary charge, ℏ the Planck constant divided by 2 π and m e the electron rest mass.
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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.B00693.
Original PDF version: http://www.iupac.org/goldbook/B00693.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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