300 attosecond response of acetylene in two-photon ionization/dissociation processes

Abstract

By performing delay scans of two replicas of a few-pulse attosecond pulse train (APT), we investigated two-photon ionization/dissociation processes of C2H2. The correlation time of the CC yield is determined to be 300 as, which is, to the best of our knowledge, the shortest correlation time ever obtained in the delay-scan measurement of two APTs. We also extracted the contribution of the resonant excitation from the ground state to a specific excited state of C2H2+ leading to C-C bond breaking by performing Fourier analyses of the yield and angular distribution of the CHC fragment ions, which are also generated within 300 as. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement