Photoelectron-Photoion Cumulant Mapping Spectroscopy Reveals Multiparticle Correlation in Strong Field Ionization of Water Experiment

Photoelectron-Photoion Spectroscopy has become a crucial tool for understanding ultrafast dynamics, providing invaluable insights into complex atomic and molecular processes. Momentum Resolved Above-Threshold Ionization (MRATI) [1] has shown that fragment ions with different momenta have strikingly different photoelectron spectrum, shedding light on the ionization dynamics originating from different molecular orbitals. The recently developed multiparticle cumulant mapping (or higher-order covariances) method [2] has demonstrated promising capabilities in unveiling photoion-photoion correlation, which has the potential to accelerate the data acquisition speed and provide more ionization channels. We extend the method to look for photoelectron-photoion correlation in strong field ionization experiments with water molecules.

[1] Cheng, C., Forbes, R., Howard, A.J., Spanner, M., Bucksbaum, P.H. and Weinacht, T., 2020. Momentum-resolved above-threshold ionization of deuterated water. Physical Review A, 102(5), p.052813.

[2] Cheng, C., Frasinski, L.J., Moğol, G., Allum, F., Howard, A.J., Rolles, D., Bucksbaum, P.H., Brouard, M., Forbes, R. and Weinacht, T., 2023. Multiparticle Cumulant Mapping for Coulomb Explosion Imaging. Physical Review Letters, 130(9), p.093001.