The constructive summing of direct and indirect channels above the absorption threshold of a core level can cause a massive increase in the emission cross section, leading to a phenomenon called "resonant photoemission." Using novel magnetic linear dichroism in angular distribution photoelectron spectroscopy experiments and theoretical simulations, we have probed the nature of the resonant photoemission process in Gd metal. It now appears that temporal matching as well as energy matching is a requirement for true resonant photoemission.
S. R. Mishra et al., "Investigation of Resonant Photoemission in Gd with X-Ray Linear Dichroism," Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, vol. 17, no. 4, pp. 1313-1318, AVS Science and Technology Society, Jul 1999.
The definitive version is available at http://dx.doi.org/10.1116/1.581812
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