${{\mathit e}}$ MASS

INSPIRE   PDGID:
S003M
The mass is known more precisely in u (atomic mass units) than in MeV. The conversion is: 1 u = 931.494 102 42(28) MeV/c${}^{2}$ (2018 CODATA value, TIESINGA 2021). The conversion error dominates the uncertainty of the masses given below.

VALUE (MeV) DOCUMENT ID TECN  COMMENT
$0.51099895000$ $\pm0.00000000015$
TIESINGA
2021
RVUE 2018 CODATA value
• • We do not use the following data for averages, fits, limits, etc. • •
$0.5109989461$ $\pm0.0000000031$
MOHR
2016
RVUE 2014 CODATA value
$0.510998928$ $\pm0.000000011$
MOHR
2012
RVUE 2010 CODATA value
$0.510998910$ $\pm0.000000013$
MOHR
2008
RVUE 2006 CODATA value
$0.510998918$ $\pm0.000000044$
MOHR
2005
RVUE 2002 CODATA value
$0.510998901$ $\pm0.000000020$ 1, 2
BEIER
2002
CNTR Penning trap
$0.510998902$ $\pm0.000000021$
MOHR
1999
RVUE 1998 CODATA value
$0.510998903$ $\pm0.000000020$ 1, 3
FARNHAM
1995
CNTR Penning trap
$0.510998895$ $\pm0.000000024$ 1
COHEN
1987
RVUE 1986 CODATA value
$0.5110034$ $\pm0.0000014$
COHEN
1973
RVUE 1973 CODATA value
1  Converted to MeV using the 1998 CODATA value of the conversion constant, $931.494013$ $\pm0.000037$ MeV/u.
2  BEIER 2002 compares Larmor frequency of the electron bound in a ${}^{12}\mathrm {C}{}^{5+}$ ion with the cyclotron frequency of a single trapped ${}^{12}\mathrm {C}{}^{5+}$ ion.
3  FARNHAM 1995 compares cyclotron frequency of trapped electrons with that of a single trapped ${}^{12}\mathrm {C}{}^{6+}$ ion.
References