, , J J J
J = J + J. (6.52)
, E
J = μE. (6.53)
(. 5.1) , . (. 5.3), , .
, , . , , .
J >> J. (6.54)
.
. J ≈2,5∙105 /, J ≈39 / = 100 /, .. (6.54) . , .
E J ≈0,1 J. . . (6.53)
D J = μ. (6.55)
, , .
. . 5.2, - ~ J -1/2. (6.55)
Δ υ ~ -1/2. (6.56)
- u ~ J 3/2.
Δ υ ~ 3/2. (6.57)
, , - . τ, .
, (6.58)
, . 5.2, , μ (). . 6.5, .
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. 6.5. : - - ; -
, - , - . , - (. . 5.6, )
, . , .
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, . , , , ( ) ( ).
( ) . , D W. D E- D W, n 0
. (6.59)
D W 0, , :
, (6.60)
ε . (6.59) (6.60)
, (6.61)
.
.
σ = σ 0 exp[ α (E - E)], (6.62)
α , .
(. 6.6) , , , . , .
. . .
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. 6.6. : , 1 ,
2 , , : ,
, , ,
, , .
(. 6.6, )
w . 2
. (6.63)
, Eg ≈1 w E ≈109 /. (6.63) , w, , , . .
, .. , , . (107 109/) , .
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. 6.6, .