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3.4: <br />
γ = d H<br />
d = d H<br />
d H + d L<br />
(3.19)<br />
<br />
X 0.01∼1nm <br />
∼0.1nm σ <br />
R Debye -Waller <br />
{ ( ) }<br />
4πσ sin θ<br />
2<br />
R = R 0 exp −<br />
(3.20)<br />
λ<br />
R 0 θ λ X σ <br />
<br />
X <br />
3.2.2 <br />
X X <br />
X <br />
X <br />
<br />
2d sin θ = mλ (3.21)<br />
d θ m λ X 3.21<br />
m 3.21<br />
(<br />
) 1<br />
2<br />
2δ − δ2<br />
2d sin θ m × 1 −<br />
sin 2 = mλ (3.22)<br />
θ m<br />
13