X-Ray Transition Energies Database by National Institute of Standards and Technology
= X-Ray Transition Energies Database by National Institute of Standards and Technology
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Primary evaluated transition-energy database. The copper experimental $KL_3$ entry is near $8047.8227\ {\rm eV}$ and can be converted into the Cu K$\alpha_1$ wavelength with $hc/E$. https://physics.nist.gov/cgi-bin/XrayTrans/search.pl?element=Cu&lower=&units=eV&upper=