Observation of the Auger Resonant Raman Effect

Monochromatized synchrotron radiation near the photoionization threshold was used to produce the $2{{p}_{\frac{3}{2}}}^{\ensuremath{-}1}$ vacancy state in atomic Xe. Deexcitation of the state through ${L}_{3}\ensuremath{-}{M}_{4}{M}_{5}(^{1}G_{4})$ Auger-electron emission was measured. The $5d$ spectator-electron Auger satellite was observed. The satellite energy exhibits linear dispersion as a function of the photon energy of the exciting radiation. The observed width of the $^{1}G$ diagram line decreases by \ensuremath{\sim} 40% at threshold. This radiationless process can thus be construed as the Auger analog of the x-ray resonant Raman effect.