Electron mass
The electron mass or electron rest mass (symbol: me) is a fundamental physical constant. It can be expressed in kilograms, in which case it is determined by the measurement of other physical constants, or as the electron relative atomic mass (symbol: Ar(e)), the mass ratio of the electron mass to one-twelfth of the mass of a carbon-12 atom, which can be measured almost directly. The 2006 CODATA recommended values are:[1]
- me = 9.109 382 15(45) kg
- Ar(e) = 5.485 799 0943(23) × 10−4
Electron relative atomic mass
The electron relative atomic mass, Ar(e), is measured by comparing the cyclotron frequencies of electrons and 12C6+ ions confined in a Penning trap.[2]
Notes and references
Notes
References
- ↑ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>.
- ↑ Farnham, Dean L.; Van Dyck, Robert S., Jr.; Schwinberg, Paul B. Determination of the Electron's Atomic Mass and the Proton/Electron Mass Ratio via Penning Trap Mass Spectroscopy. Phys. Rev. Lett. 1995, 75 (20), 3598–3601. DOI: 10.1103/PhysRevLett.75.3598.
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