Model for the Attosecond Resonant Photoemission of Copper Dichloride: Evidence for High-Order Fano Resonances and a Time-Domain Core-Hole Clock

Abstract

We present a model of the attosecond resonant dynamics of valence electron photoemission and MMM Auger electron emission in copper dichloride. At τ(h)≫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.