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Title: Symmetry-resolved CO desorption and oxidation dynamics on O/Ru(0001) probed at the C K-edge by ultrafast X-ray spectroscopy

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0114399· OSTI ID:1890467
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  1. Chapman Univ., Orange, CA (United States)
  2. Stockholm Univ. (Sweden)
  3. KTH Royal Inst. of Technology, Stockholm (Sweden)
  4. Columbia Univ., New York, NY (United States)
  5. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  7. National Research Council (CNR), Trieste (Italy). Inst. of Materials (CNR-IOM)
  8. National Research Council (CNR), Lecce (Italy). National Inst. for the Physics of Matter (INFM), National Lab. TASC
  9. Elettra-Sincrotrone Trieste (Italy)
  10. Consiglio Nazionale delle Ricerche (CNR), Rome (Italy). Istituto di Struttura della Materia (CNR-ISM)
  11. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  12. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  13. Leiden Univ. (Netherlands)
  14. National Research Council (CNR), Rome (Italy)
  15. Stanford Univ., CA (United States)

In this work, we report on carbon monoxide desorption and oxidation induced by 400 nm femtosecond laser excitation on the O/Ru(0001) surface probed by time-resolved X-ray absorption spectroscopy (TR-XAS) at the carbon K-edge. The experiments were performed under constant background pressures of CO (6x10-8 Torr) and O2 (3x10-8 Torr). Under these conditions, we detect two transient CO species with narrow 2π* peaks, suggesting little 2π* interaction with the surface. Based on polarization measurements, we find that these two species have opposing orientations: (1) CO favoring a more perpendicular orientation and (2) CO favoring a more parallel orientation with respect to the surface. We also directly detect gas-phase CO2 using a mass spectrometer and observe weak signatures of bent adsorbed CO2 at slightly higher X-ray energies than the 2π* region. These results are compared to previously reported TR-XAS results at the O K-edge where the CO background pressure was three times lower (2x10-8 Torr) while maintaining the same O2 pressure. At the lower CO pressure, in the CO 2π* region, we observed adsorbed CO and a distribution of OC-O bond lengths close to the CO oxidation transition state, with little indication of gas-like CO. The shift towards 'gas-like' CO species may be explained by the higher CO exposure, which blocks O adsorption, decreasing O coverage and increasing CO coverage. These effects decrease the CO desorption barrier through dipole-dipole interaction, while simultaneously increasing the CO oxidation barrier.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Knut and Alice Wallenberg Foundation; Swedish Research Council (SRC); Helmholtz Association; SIR Foundation; USDOE
Contributing Organization:
SUNCAT
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; FWP 100435; 2016.0042; 2013-8823; VH-NG-1005; Nr RBSI14G7TL; CUP B82I15000910001
OSTI ID:
1890467
Alternate ID(s):
OSTI ID: 1894521
Journal Information:
Journal of Chemical Physics, Vol. 157, Issue 16; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)