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DAFS - Universidad de Zaragoza

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Efectos <strong>de</strong> polarización en I diff<br />

I ∝<br />

diff<br />

' ˆ F εˆ<br />

σπ<br />

εσπ hkl<br />

( 1 0 0)<br />

εˆ<br />

( 0 senθ cosθ)<br />

εˆ<br />

=<br />

σ = π<br />

Rotación en φ <strong>de</strong>l cristal<br />

⎛cosφ − sinφ<br />

⎜<br />

−1<br />

= R(<br />

φ ) F00<br />

R(<br />

φ ) R(<br />

φ ) = ⎜ sinφ<br />

cosφ<br />

⎜<br />

⎝ 0 0<br />

'<br />

F00l l<br />

Polarización <strong>de</strong>l<br />

haz inci<strong>de</strong>nte σ<br />

φ = 0 ⇒ I<br />

σ −σ<br />

φ = 45º<br />

⇒ I<br />

I(<br />

002 ) ⇒ I<br />

I(<br />

006 ) ⇒ I<br />

σ −σ<br />

σ −π<br />

σ −π<br />

I<br />

I<br />

= 0<br />

σ−σ<br />

σ−π<br />

I<br />

= 16 f<br />

∝ 16 f<br />

∝ 16 f<br />

σ −π<br />

2<br />

b<br />

= 16 f<br />

I<br />

(max) = 4%<br />

Iσ<br />

(max) = 40%<br />

I<br />

b<br />

b<br />

b<br />

σ −π<br />

−σ<br />

2<br />

2<br />

2<br />

σ −σ<br />

2<br />

( sin 2φ)<br />

sin<br />

sin<br />

= 0<br />

2<br />

2<br />

θ<br />

(max)<br />

(max)<br />

θ<br />

2<br />

( ) 2<br />

cos 2φ<br />

0⎞<br />

⎟<br />

0⎟<br />

1⎟<br />

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