E1
g1
g0
N = number of atoms
N1= number in high energy state
N0= number in ground state
N0 g0
N
=
g0 + g1exp{-E1/kT}
N1 g1exp{-E1/kT}
N
=
g0 + g1exp{-E1/kT}
_____i gi exp{-Ei / kT}
F = -kT ln _
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