TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers

TL;DR

The paper introduces TEXS, a large solid angle in-vacuum X-ray emission spectrometer with 11 Johansson analyzers, optimized for 1.5-5.5 keV energies, enabling high-resolution, in situ measurements with innovative energy scanning.

Contribution

It presents a novel spectrometer design with 11 analyzers, innovative energy scanning, and in-vacuum setup for advanced X-ray emission spectroscopy.

Findings

Achieved energy bandwidth below core hole lifetime broadening.

Demonstrated effective energy scanning with minimal motor motions.

Designed for in situ and operando experiments in catalysis.

Abstract

We describe the design and show first results of a large solid angle X-ray emission spectrometer that is optimized for energies between 1.5 keV and 5.5 keV. The spectrometer is based on an array of 11 cylindrically bent Johansson crystal analyzers arranged in a non-dispersive Rowland circle geometry. The smallest achievable energy bandwidth is smaller than the core hole lifetime broadening of the absorption edges in this energy range. Energy scanning is achieved using an innovative design, maintaining the Rowland circle conditions for all crystals with only four motor motions. The entire spectrometer is encased in a high-vacuum chamber that allocates a liquid helium cryostat and provides sufficient space for in situ cells and operando catalysis reactors.