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SUMMARY:Seeing the Unseen: Detection of Reactive Intermediates with VUV Sy
 chrotron Radiation
DTSTART:20260312T170000
DTEND:20260312T180000
DTSTAMP:20261002T005340Z
UID:fb6327712d230c6a9be65707be66c7cde0e509ba4ff9eaa3a01c41c2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Patrick Hemberger\, Paul Scherrer Institute\nChemical reaction
 s are controlled by species we rarely detect: e.g. short-lived carbenes\, 
 radicals\, and ketenes steer reaction pathways and ultimately determine se
 lectivity and yield. Conventional tools such as GC/MS or NMR usually miss 
 intermediates\, even though mechanistic insight is urgently needed for rat
 ional process optimization.\n\nIn this talk\, I introduce Photoelectron Ph
 otoion Coincidence (PEPICO) spectroscopy with vacuum ultraviolet (VUV) syn
 chrotron radiation at the Swiss Light Source as a multiplexed approach to 
 reaction analysis. By detecting both ions and electrons after VUV ionizati
 on\, PEPICO connects mass spectrometry with isomer-selective photoelectron
  fingerprints\, allowing us to disentangle complex reaction mixtures.\n\nW
 e will illustrate how this approach changes our mechanistic understanding 
 in heterogeneous catalysis and high-temperature chemistry\, including zeol
 ite-catalyzed plastic pyrolysis\, where we identify mechanistic routes to 
 benzene\, toluene\, and xylenes. Moreover\, we turn to biomass conversion\
 , where transient ketenes are the unwelcome guests that steer selectivity 
 off-target.\n\nI will leave you with a practical sense of what intermediat
 es we can observe\, how spectra are interpreted\, and where PEPICO detecti
 on can unveil new mechanistic insights.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495 https://epfl.
 zoom.us/j/65379828256?pwd=aw875mvqabNaNv5UeGbWXapVx0n6BQ.1
STATUS:CONFIRMED
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