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18. Let the energy of the state in question be an amount
∆
E
above the Fermi energy
E
F
.
Then, Eq. 416 gives the occupancy probability of the state as
FF
()
/
/
11
.
EE
Ek
T
T
P
ee
+∆ −
∆
==
+
+
We solve for
∆
E
to obtain
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 Spring '08
 Any
 Physics, Energy

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