Launch of a new research project:

Compact laser-produced plasma source for high-resolution spectroscopy in the soft and medium X-ray range using a flat jet sample feeder (KOPAS)

Date: 01.10.2023

The BMFTR-funded project „KOPAS“ aims to develop a laser-based plasma source for spectroscopy in the soft and tender X-ray energy regime.

X-ray absorption spectroscopy is a powerful method for chemical analysis on surfaces and thin films. It provides insight into the bonding conditions and oxidation states of absorbing chemical elements. It is therefore highly relevant for the development of catalytic processes or battery cells (e.g., sodium-ion batteries), and various other applications. However, only large research facilities are currently available for this purpose, limiting access to this measurement technology. Therefore, there is a considerable need for decentralized, compact laboratory systems for analytical X-ray measurement technology.

The new laser and target development will produce higher-energy radiation. The enhanced spectrometer aims to achieve resolution and sensitivity comparable to synchrotron measurements. In addition, a novel method will be researched to examine liquids or substances dissolved in liquids under vacuum. The experience and knowledge gained from X-ray absorption spectroscopy (NEXAFS) R&D over the past few years in the department provide a strong basis for successful implementation of the project over the next 2 ½ years.

At the end of the project, a tabletop system comprising a radiation source, a spectrometer, and an optional liquid jet for continuous sample delivery should be available as a very compact unit, the first of its kind in the world. The device is intended to accurately measure the X-ray absorption edges in the energy range from < 1 keV to approximately 3 keV and thus provide affordable and compact analysis for many important chemical elements (including C, Ca, N, O, Mn, Fe, Co, Ni, Cu, Zn, S), which is of great interest in the areas of biology, medicine, geology and the development of new functional materials.

Further information: https://www.quantensysteme.info/projektatlas/projekte/q/kopas

Figure 1: Compact laboratory setup for high-resolution X-ray absorption spectroscopy. Image: Institute for Nanophotonics Göttingen e.V. & Advanced Micofluidic Systems GmbH.
Figure 2: A thin liquid lamella is shown on the left, which is used to provide a liquid sample in a vacuum environment. On the right, a spectrum of iron(III) nitrate dissolved in water is shown, displaying different absorption edges.