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Updated: Aug 16, 2025

Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
Published on: January 10, 2025
X-Ray absorption spectroscopy on airborne aerosols
Muhammad H Rashid1, Camelia N Borca1, Jacinta M Xto1
1Paul Scherrer Institute, Swiss Light Source, Laboratory for Femtochemistry Forschungsstrasse 111 Villigen PSI Switzerland Thomas.Huthwelker@psi.ch.
Researchers developed a new X-ray absorption spectroscopy (XAS) method for airborne aerosols. This technique analyzes elemental composition and chemical states of particles, crucial for atmospheric science and chemical applications.
Area of Science:
- Atmospheric Chemistry
- Materials Science
- Spectroscopy
Background:
- X-ray absorption spectroscopy (XAS) offers detailed insights into elemental composition, chemical state, and structure.
- Studying airborne aerosols is critical for understanding atmospheric processes and chemical reactions.
Purpose of the Study:
- To demonstrate a novel method for performing XAS on airborne aerosols.
- To enable *in situ* analysis of aerosol properties relevant to atmospheric science and chemistry.
Main Methods:
- Aerosols generated from salt solutions (CaCl2, KCl, (NH4)2SO4) were dried and guided into an experimental chamber.
- A stable, free-flowing aerosol stream was created and exposed to a monochromatic X-ray beam.
- Fluorescent light emitted from the aerosol was collected for spectroscopic analysis.
Main Results:
- The system successfully analyzed airborne aerosols with particle sizes from 10 to 100s of nm.
- Detection limits were sufficient to observe subtle spectroscopic signatures with 1-2 hour integration times.
- Functionality was demonstrated for environmentally relevant salt aerosols.
Conclusions:
- This novel XAS setup provides new research opportunities for *in situ* studies of aerosol nucleation and reactions.
- The method is applicable to multicomponent aerosol systems and airborne matter.
- It holds relevance for both atmospheric science and general chemical applications.
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