Reflection high-energy electron diffraction (RHEED)
Reflection high-energy electron diffraction (RHEED)
Reflection high-energy electron diffraction (RHEED)
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"Atomic notation": n l j j = l ± sAtomic NotationX-ray Notation1s K 12s L 12p 1/2 L 22p 3/2 L 33s M 13p 1/2 M 23p 3/2 M 33d 3/2 M 43d 5/2 M 5Position of edge slightly sensitive to "chemical environment" of atom -oxidation state, bonding environment - producing a chemical shiftAbsorption is same as optical absorptionI = I 0 ⋅exp( −α(hν)⋅ l)A = Ψ i µ Ψ f2Absorption α(hν) generally strongest at absorption edge then decreasesFine structure (small intensity modulation) appears in x-ray absorptionspectrum above edge(1) Extended X-ray Absorption Fine Structure (EXAFS)(2) Near-Edge X-ray Absorption Fine Structure (NEXAFS) or X-rayAbsorption Near-Edge Structure (XANES)CEM 924 7.8 Spring 2001
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