title: Isomer-Selective Detection of Aromatic Molecules in Temperature-Programmed Desorption for Model Catalysis.
abstract: Based on three different molecules dosed on a Pt(111) single crystal the selectivity and sensitivity of REMPI-TPD in UHV is investigated for a potential application in heterogeneous catalysis. It is shown that the two structural isomers ethylbenzene and p-xylene can be discriminated by REMPI in a standard TPD experiment. The latter is not possible for the ionization with electrons in a Q-MS. It is further demonstrated by benzene TPD studies that the sensitivity of the REMPI-TOF-MS is comparable to commercial EI-Q-MS solutions and enables the detection of less than 0.6% molecules of a monolayer.
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Winbauer
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Sebastian L
authors.initials: SL
authors.lastname: Kollmannsberger
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Constantin A
authors.initials: CA
authors.lastname: Walenta
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Schreiber
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Josef
authors.initials: J
authors.lastname: Kiermaier
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Tschurl
authors.affiliation: Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: Ueli
authors.initials: U
authors.lastname: Heiz