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Conference Paper

Probing Ionization Energies for Trace Gas Identification: The Micro Photo Electron Ionization Detector (PEID)

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Velasco-Velez,  Juan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Doll, T., Oberröhrmann, J., Baum, S., Köhler, R., Schütte, H., Gassmann, S., et al. (2021). Probing Ionization Energies for Trace Gas Identification: The Micro Photo Electron Ionization Detector (PEID). In E. Massera (Ed.), CSAC2021: 1st International Electronic Conference on Chemical Sensors and Analytical Chemistry: session Gas Sensors. Basel: MDPI. doi:10.3390/CSAC2021-10431.


Cite as: https://hdl.handle.net/21.11116/0000-0008-E45A-2
Abstract
Micro gas sensors detect the presence of substances, but can hardly identify them. We developed a novel approach of probing referenceable ionization energies. It extends the photoionization principle towards tunable energies via replacement of photons by accelerated photo electrons. The device comprises UV-LED illumination, an atmospherically stable photoelectron emission layer with a nano-vacuum electronics accelerator realized in thin film technology and charged particle measurement. A voltage variation at the accelerator provides electrons of tunable energies. We were able to prove that variable electron energies can be used for substance detection. The resulting system reaches ambient conditions operability. The actual limitations and challenges are discussed.