# Johann-type laboratory-scale X-ray absorption spectrometer with versatile detection modes

## TL;DR

This paper introduces a cost-effective, versatile laboratory X-ray absorption spectrometer capable of multi-mode measurements in the 4-20 keV range, suitable for diverse materials and in situ studies.

## Contribution

It presents a modular, low-cost spectrometer design using conventional components, enabling flexible XAS measurements in various modes for the first time at this scale.

## Key findings

- Achieves 1-5 eV energy resolution at 10 keV
- Supports transmission, fluorescence, and imaging modes
- Demonstrates applicability in diverse sample environments

## Abstract

We present a low-cost laboratory X-ray absorption spectrometer that uses a conventional X-ray tube source and bent Johann-type crystal monochromators. The instrument is designed for XAS studies in the 4-20 keV range which covers most K edges of 3d transition metals and L edges of 5d transition metals and actinides. The energy resolution is typically in the range of 1-5 eV at 10 keV depending on the crystal analyser and the Bragg angle. Measurements can be performed in transmission, fluorescence, and imaging modes. Due to its simple and modular design, the spectrometer can be modified to accommodate additional equipment and complex sample environments required for e.g. in situ studies. A showcase of various applications is presented.