# Fully general time-dependent multiconfiguration self-consistent-field method for the electron-nuclear Dynamics

## TL;DR

This paper introduces a comprehensive time-dependent multiconfiguration self-consistent-field method capable of modeling complex electron-nuclear dynamics involving multiple particle types and interactions, enabling first-principles simulations of molecular responses to intense laser fields.

## Contribution

It develops a fully general, flexible framework for simulating correlated multielectron and multinucleus quantum dynamics with arbitrary configuration spaces.

## Key findings

- Derives equations of motion for CI coefficients and spin-orbitals.
- Allows modeling of complex molecular dynamics under intense laser fields.
- Provides a first-principles approach for electron-nuclear interactions.

## Abstract

We present the fully general time-dependent multiconfiguration self-consistent-field method to describe the dynamics of a system consisting of arbitrary different kinds and numbers of interacting fermions and bosons. The total wave function is expressed as a superposition of different configurations constructed from time-dependent spin-orbitals prepared for each particle kind. We derive equations of motion followed by configuration-interaction (CI) coefficients and spin-orbitals for general, not restricted to full-CI, configuration spaces. The present method provides a flexible framework for the first-principles theoretical study of, e.g., correlated multielectron and multinucleus quantum dynamics in general molecules induced by intense laser fields and attosecond light pulses.