44 citations · 69 across the 4 of their papers we have counts for
4 papers
Interference between Extrinsic and Intrinsic Losses in XAFS
L. Campbell, L. Hedin, J. J. Rehr +1
The interference between extrinsic and intrinsic losses in x-ray absorption fine structure (XAFS) is treated within a Green's function formalism, without explicit reference to fina…
The sudden approximation in photoemission and beyond
L. Hedin, J. D. Lee
The conditions behind the sudden approximation are critically examined. The fuzzy band expression is derived in detail from first principles. We go beyond the sudden approximation…
External losses in photoemission from strongly correlated quasi two-dimensional solids
L. Hedin, J. D. Lee
New expressions are derived for photoemission, which allow experimental electron energy loss data to be used for estimating losses in photoemission. The derivation builds on new re…
The transition from the adiabatic to the sudden limit in core level photoemission: A model study of a localized system
J. D. Lee, O. Gunnarsson, L. Hedin
We consider core electron photoemission in a localized system, where there is a charge transfer excitation. The system is modelled by three electron levels, one core level and two…