Nilson Dias Vieira Junior - Faap
Nilson Dias Vieira Junior - Faap
Nilson Dias Vieira Junior - Faap
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X-rays and neutrons for diffraction studies<br />
Property X-rays Neutrons<br />
General<br />
nature of<br />
scattering by<br />
atoms<br />
Magnetic<br />
scattering<br />
Electronic<br />
Regular increase of<br />
scattering amplitude<br />
(f) with atomic number<br />
(Z), calculable from<br />
known electronic<br />
configurations.<br />
No differences<br />
among isotopes.<br />
No additional<br />
scattering.<br />
Nuclear<br />
Irregular variation of<br />
scattering amplitude (b)<br />
with Z. Dependent on<br />
nuclear structure and<br />
only determined<br />
empirically by<br />
experiment.<br />
Scattering amplitude<br />
is different for different<br />
isotopes.<br />
Additional scattering by<br />
atoms with magnetic<br />
moments:<br />
(1) Diffuse scattering by<br />
paramagnetic materials<br />
(2) Coherent diffraction<br />
peaks from<br />
ferromagnetic and<br />
antiferromagnetic<br />
materials.<br />
Nuclear is Good for<br />
light Atomos<br />
Marking with<br />
isotopes is<br />
feasible<br />
Good for<br />
magnetic<br />
materials
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