New Infrared Laser Enhances Single-Particle Analysis – Breakthrough by Researchers in the CRC LiMatI

The newly developed Er:YAG laser was integrated in a sophisticated laser excitation scheme designed to analyze the composition of individual particles via mass spectrometry. In direct comparison, the new laser outperforms a conventional CO₂ laser, offering greater robustness and suitability for remote and aircraft-based applications.

Researchers from the Collaborative Research Center Light-Matter Interactions have, together with international partners, developed a novel solid-state infrared laser that significantly advances single-particle mass spectrometry. 

The new laser enables a highly precise two-step desorption–ionization process for analyzing individual aerosol particles—an important step toward detailed, real-time chemical characterization of airborne matter. The technology is rooted in a deep understanding of light-matter interactions, showcasing the interdisciplinary excellence of the research center.

This work marks a significant contribution to the development of advanced environmental measurement techniques, with direct relevance for climate research and air quality monitoring.

Publication: 
Schmidt, M., Hakkim, H., Anders, L., Kalamašņikovs, A., Kröger-Badge, T., Irsig, R., Graf, N., Kelnberger, R., Passig, J., and Zimmermann, R.: A solid-state infrared laser for two-step desorption–ionization processes in single-particle mass spectrometry, Atmos. Meas. Tech., 18, 2425–2437, 2025.
DOI: https://doi.org/10.5194/amt-18-2425-2025

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