(3) Interaction of high energy photons with matter - LUTH
(3) Interaction of high energy photons with matter - LUTH
(3) Interaction of high energy photons with matter - LUTH
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Photoelectric Absorption<br />
Similar to the «Photoelectric Effect», first explained by Einstein:<br />
Photons <strong>with</strong> sufficiently <strong>high</strong> energies can eject electrons from the<br />
atomic «shells». The difference between the photon <strong>energy</strong> and<br />
ionisation <strong>energy</strong> provides kinetic <strong>energy</strong> for the freed electron:<br />
E kin = ( ℏ - E I )<br />
P.e. Absorption is the photoelectric effect <strong>with</strong> electrons from lowlying<br />
<strong>energy</strong> levels. Photons in the X-ray range are needed (~keV):<br />
ℏ
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