Time-Resolved X-ray Absorption Spectroscopy: An MCTDH Quantum Dynamics Protocol.

ABSTRACT: Expressions for linear and nonlinear spectroscopy simulation in the X-ray window in which the time evolution of a photoexcited molecular system is treated via quantum dynamics are derived. By leveraging on the peculiar properties of core-excited/ionized states, first- and third-order response functions are recast in the limit of time-scale separation between the extremely short core-state lifetime and the (comparably longer) electronic-state transfer and nuclear vibrational motion. This work is a natural extension of Segatta et al. (J. Chem. Theory Comput. 2023, 19, 2075-2091), in which some of the present authors coupled MCTDH quantum dynamics to spectroscopy simulation at different levels of sophistication. Full quantum dynamics and approximate expressions are compar

SUBMITTER: Segatta F 

PROVIDER: S-EPMC10782456 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature