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General

Constant Value Units
c 2.997925 1010cm/s
e 4.80325 10-10 emu
h/2p 1.05459 10-27 erg s
NA 6.02217 1023
a.m.u. 1.66053 10-24 g
me 9.10956 10-28 g
mp 1.67261 10-24 g
mn 1.674954 10-24 g
lC=h/(2 p me c) 3.86159 10-11 cm
a0 5.29177 10-9 cm
mB 9.27410 10-21 erg/G
kB 1.38062 10-16 erg/K
r0=e2/mec2 0.281794 10-12 cm
h2/(8 p mN) 2.072142 meV A2

Energy units

1 meV = 0.241797 THz = 8.065478 cm-1 = 11.60497 K

Relations for neutrons

E [meV] = 2.072142 (k [A-1])2
l [A] = 2 p/k = 9.044605/sqrt(E [meV])
k=4psinq/l

Magnetic Form Factors of 3d ions