DAFS - Universidad de Zaragoza
DAFS - Universidad de Zaragoza
DAFS - Universidad de Zaragoza
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Multi-wavelenght Anomalous Diffraction (MAD)<br />
2<br />
2<br />
⎡<br />
FA<br />
' ⎤ ⎡<br />
FA<br />
'<br />
⎤<br />
I0( E ) = ⎢ FT<br />
cos(<br />
ϕT<br />
− ϕA<br />
) + f ( ) + ( )<br />
0 A E ⎥ ⎢ FT<br />
sin ϕT<br />
− ϕA<br />
+ f ( E )<br />
0 A ⎥<br />
⎣<br />
fA<br />
⎦ ⎣<br />
fA<br />
⎦<br />
F A do not <strong>de</strong>pend on the energy ; |F T | , φ T - φ A (or |F N | , φ N - φ A )<br />
sligthly <strong>de</strong>pend on E ; f’ A and f’’ A strongly <strong>de</strong>pend on E near an<br />
absorption edge<br />
Then, by measuring I(E) at several energies near an absorption edge<br />
one can <strong>de</strong>termine |F T | , φ T - φ A (or |F N | , φ N - φ A )and|F A |
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