Reflection high-energy electron diffraction (RHEED)
Reflection high-energy electron diffraction (RHEED)
Reflection high-energy electron diffraction (RHEED)
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Most often raw α(hν) versus hν data is re-plotted versus wavevector k (=2·π/λ)nλ =2⋅r ⋅ ( 2m[ hν photon − hν threshold ]) ( [ ]) 1/2k= 2m hν photon − hν threshold2⋅π⋅hh( ) 1/2=0.5123 hν photon − hν threshold2⋅π1/2= 2⋅r⋅kwhere k is in Å -1 and hν in eV. Fourier-transform of α(hν) versus k givesnearest-neighbor distances (and intensity gives number of atoms)CEM 924 7.12 Spring 2001
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