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Liquid Jet X-Ray Photoelectron Spectroscopy |
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We use Liquid jet X-ray spectroscopy (LJ-XPS) to investigate the distributions of solutes in aqueous solutions near the interface and in the bulk of solution. These fundamental studies are very important for understanding atmospheric chemistry where reactions occur at the surfaces of aqueous aerosols. In this technique, we probe a liquid jet of solution using synchrotron based XPS. Here, the jet is illuminated with tunable energy X-rays, which excite photoelectrons from the atoms in the solution. The photoelectrons pass through a differnetially pumped stage to the analyzer where they are detected. XPS spectra can tell us about relative concentrations and chemical environments of molecules. In addition, this technique allows us to look at different depths in solution. For example, we are able to selectively sample from the surface by generating low energy photoelectrons which are attenuated from the bulk, and are only detected from the surface. We currently preform experiments using the BESSY synchrotron in Berlin, Germany, and the Advanced Light Source at Lawrence Berkeley National Laboratory. Berliner Elektronen-Speicherring Gesellschaft für Synchrotronstrahlung (BESSY) Advanced Light Source at Berkeley Lawrence National Laboratory (ALS)
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