The phenomenon of resonant photoemission happens when, in addition to a direct photoemission channel, a second indirect channel opens up as the absorption threshold of a core level is crossed. A massive increase in emission cross section can occur, but the nature of the process remains clouded. Using novel magnetic linear dichroism in photoelectron spectroscopy experiments and theoretical calculations, we can now clearly demonstrate that temporal matching of the processes as well as energy matching is a requirement for true "resonant photoemission.".
S. R. Mishra et al., "Nature of Resonant Photoemission in Gd," Physical Review Letters, vol. 81, no. 6, pp. 1306-1309, American Physical Society (APS), Aug 1998.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.81.1306
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