Model for the attosecond resonant photoemission of copper dichloride: Evidence for high-order Fano resonances and a time-domain core-hole clock

We present a model of the attosecond resonant dynamics of valence electron photoemission and MMM Auger electron emission in copper dichloride. At τ_hâ‰1/ω_IR (where τ_h is the core-hole relaxation time and ω_IR is the energy of the infrared probe field), high-order Fano sideband resonances on both sides of the original (zeroth-order) resonance are found in the energy domain on the time scale of τ_h. This is confirmed by a coherent π rotation of the relative phase between the photoelectron and Auger electron at each resonance, due to the subfemtosecond quantum correlation. We also find a core-hole clock, the asymmetry factor q of the first-order Fano sideband resonance, which can directly trace the core-hole relaxation in the time domain.