General theory of photoexcitation induced photoelectron circular dichroism

TL;DR

This paper develops a comprehensive theoretical framework for photoexcitation induced photoelectron circular dichroism (PXECD), enabling detailed analysis of chiral and non-chiral contributions in photoelectron angular distributions for various polarizations.

Contribution

It provides explicit formulas and a clear separation of chiral and non-chiral effects in PXECD, extending the understanding of coherence tracking in both chiral and non-chiral molecules.

Findings

Derived explicit asymmetry parameters for arbitrary polarizations.

Separated chiral and non-chiral contributions in the angular distribution.

Demonstrated mixing of PXECD and PECD effects with arbitrary polarization.

Abstract

The photoionization of chiral molecules prepared in a coherent superposition of excited states can give access to the underlying chiral coherent dynamics in a procedure known as photoexcitation induced photoelectron circular dichroism (PXECD). This exclusive dependence on coherence can also be seen in a different part of the angular spectrum, where it is not contingent on the chirality of the molecule, thus allowing extension of PXECD's sensitivity to tracking coherence to non-chiral molecules. Here we present a general theory of PXECD based on angular momentum algebra and derive explicit expressions for all pertinent asymmetry parameters which arise for arbitrary polarisation of pump and probe pulses. The theory is developed in a way that clearly and simply separates chiral and non-chiral contributions to the photoelectron angular distribution, and also demonstrates how PXECD and PECD-type contributions, which may be distinguished by whether pump or ionizing probe enables chiral response, are mixed when arbitrary polarization is used.