Theory of ac-Stark splitting in core-resonant Auger decay under strong x-ray fields

TL;DR

This paper investigates how intense x-ray fields modify Auger decay line shapes, revealing a doublet structure due to Rabi coupling and demonstrating control over ion yields through x-ray frequency tuning.

Contribution

It introduces a theoretical framework for understanding ac-Stark splitting in core-resonant Auger decay under strong x-ray fields, highlighting controllable ion yields.

Findings

Auger line shape develops into a doublet under strong x-ray fields

Energy separation of the doublet is determined by Rabi coupling strength

Charge-resolved ion yields can be controlled by x-ray frequency

Abstract

In this work we report the modification of the normal Auger line shape under the action of an intense x-ray radiation. Under strong Rabi-type coupling of the core, the Auger line profile develops into a doublet structure with an energy separation mainly determined by the relative strength of the Rabi coupling. In addition, we find that the charge resolved ion yields can be controlled by judicious choice of the x-ray frequency.