Resonant Photoemission and Linear Dichroism in Gd*

Magnetic Linear Dichroism in Angular Distributions (MLDAD) from Photoelectron Emission was used to probe the nature of Resonant Photoemission. Gd 5p and Gd 4f emission were investigated. Using novel theoretical simulations, we were able to show that temporal matching is a requirement for ÒTrueÓ Resonant Photoemission, where the Resonant Photoemission retains the characteristics of Photoelectron Emission. Discussion Resonant Photoemission is the phenemonon where the emission of 4f and 5p electrons from rare-earth metals and their compounds is strongly enhanced because a second emission channel opens up, e.g the photon has just enough energy to excite a 4d electron to an unoccupied 4f level. In a generic picture, the indirect channel of the resonant photoemission is interpreted as due to a process where a 4d electron in the initial state is first excited to the unoccupied 4f level, forming a tightly coupled, bound intermediate state, 4d core hole plus 4f electrons. Then a decay via autoionization occurs into the final state, thus producing a final state identical to that obtained by a direct photoemission process for the ejected electron. [1] The transition rate is greatl