Hyperthermal velocity distributions of recombinatively-desorbing oxygen from Ag(111)

Arved C Dorst; Rasika E A Dissanayake; Daniel Schauermann; Sofie Knies; Alec M Wodtke; Daniel R Killelea; Tim Schäfer

doi:10.3389/fchem.2023.1248456

Hyperthermal velocity distributions of recombinatively-desorbing oxygen from Ag(111)

Front Chem. 2023 Aug 2:11:1248456. doi: 10.3389/fchem.2023.1248456. eCollection 2023.

Authors

Arved C Dorst^{1

2}, Rasika E A Dissanayake^{1

2}, Daniel Schauermann¹, Sofie Knies³, Alec M Wodtke^{1

2}, Daniel R Killelea⁴, Tim Schäfer^{1

2}

Affiliations

¹ Institute of Physical Chemistry, University of Göttingen, Göttingen, Germany.
² Max-Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
³ Faculty of Biology, Chemistry and Geosciences and Bavarian Center for Battery Technology, Bayreuth, Germany.
⁴ Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL, United States.

Abstract

This study presents velocity-resolved desorption experiments of recombinatively-desorbing oxygen from Ag (111). We combine molecular beam techniques, ion imaging, and temperature-programmed desorption to obtain translational energy distributions of desorbing O₂. Molecular beams of NO₂ are used to prepare a p (4 × 4)-O adlayer on the silver crystal. The translational energy distributions of O₂ are shifted towards hyperthermal energies indicating desorption from an intermediate activated molecular chemisorption state.

Keywords: TPD; angular distribution; energy distribution; ion imaging; molecular beams; oxygen; silver; velocity-resolved.

Grants and funding

TS acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) under grant SCHA 1946/5-1 and INST 186/1302-1 and support from the Deutscher Akademische Austauschdienst (DAAD) (Grant 57651434). RD acknowledges funding under a Georg Forster research fellowship from the Humboldt foundation. DK acknowledges support from the National Science Foundation through award CHE-2155068 and ICASEC at University of Göttingen.