J.1 Maxwell’s Equations in Gaussian Units
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The electric and magntic fields are also expressed in units of Gauss (G), where
1 G = 1
√ g
s
√
cm
.
J.1.2 Values of Fundamental Constants Expressed in Gaussian
Units
Mass of electron m e = 9.10938215×10
−28 g
Charge of electron e = 4.80320427×10
−10
g·cm 3
s
Planck’s constant ¯
h = 1.05457161074473×10
−27 erg·s
Speed of light c = 2.99792458×10
10 cm
s
(J.3)
J.1.3 The Conversion Between Gaussian and SI Units
1.0 J = 10
7 erg = 6.24150912899977×10
18 eV
1.0 erg = 6.24150912899977×10
11 eV
1.0 eV = 1.60217662×10
−12 erg
J.1.4 The Conversion Between Gaussian and Atomic Units
Atomic units express units of length, energy, etc., in terms of properties of the
hydrogen atom assuming infinite proton mass (Bethe and Salpeter 1957).
Angular momentum= ¯
h = 1 au = 1.05457161074473×10 −27 erg·s
Mass = mass of electron=1 au=9.11×10 −28 g
Length=radius of first Bohr orbit=a B =1 au= 5.2917 × 10 −9 cm.
Energy=E B =twice the ionization energy =1 au=4.3597 × 10 −11 erg.
Charge=electron charge=e =1 au=4.803×10 −10
√
g·cm 3
s