Oscillating dipole model for the X-ray standing wave enhanced fluorescence in periodic multilayers

TL;DR

This paper introduces a new theoretical model combining oscillating dipole and coupled-wave theories to analyze X-ray fluorescence enhancement in periodic multilayers, covering both primary and secondary radiation regimes.

Contribution

The paper presents a comprehensive model that extends previous approaches by efficiently handling all standing wave regimes in multilayer structures.

Findings

Model accurately predicts experimental fluorescence enhancement

Applicable to both primary and secondary radiation regimes

Matches well with existing experimental data

Abstract

Periodic multilayers give rise to enhanced X-ray fluorescence when a regime of standing waves occurs within the structure. This regime may concern the primary radiation used to induce the fluorescence, the secondary radiation of fluorescence or both of them. Until now, existing models only dealt with standing wave regime of primary radiation. We present a theoretical approach based on the oscillating dipole model and the coupled-wave theory that can treat efficiently any standing wave regime. We compare our simulations to experimental data available in the literature.