ASTRA, A Transition Density Matrix Approach to the Interaction of Attosecond Radiation with Atoms and Molecules

TL;DR

ASTRA introduces a novel formalism utilizing transition density matrices to simulate highly correlated electron dynamics in atoms and molecules under attosecond laser radiation, enabling detailed analysis of ultrafast interactions.

Contribution

The paper presents a new formalism and computer code, ASTRA, that leverages transition density matrices for efficient simulation of electron dynamics in molecules exposed to attosecond radiation.

Findings

Enables simulation of complex electron interactions during attosecond pulses

Uses transition density matrices for computational efficiency

Provides a new tool for ultrafast molecular dynamics studies

Abstract

A new formalism and computer code, ASTRA (AttoSecond TRAnsitions), has been developed to treat the interactions of short, intense radiation with molecules. The formalism makes extensive use of transition density matrices, computed using a state-of-the-art quantum chemistry code (LUCIA), to efficiently calculate the many-body inter-channel-coupling interactions required to simulate the highly correlated electron dynamics due to atoms and molecules exposed to attosecond laser radiation.