Verification of the core-hole-clock method using two different time references: Attosecond charge transfer in c(4 × 2)S/Ru(0 0 0 1)

Core-hole-clock spectroscopy determines ultra fast dynamics initiated at an atomically localized core excitation in comparison to femtosecond and attosecond core hole lifetimes. Using two different core hole resonances, the experimental proof has been conducted, that the charge transfer process in the core excited intermediate state is probed, but not governed by the ultra fast core hole decay life time.