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Title: Accuracy of XAS theory for unraveling structural changes of adsorbates: CO on Ni(100)

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/5.0028002· OSTI ID:1688464

Studying surface reactions using ultrafast optical pump and X-ray probe experiments relies on accurate calculations of X-ray spectra of adsorbates for correct identification of the spectral signatures and their dynamical evolution. We show that experimental XAS can be well reproduced for the different binding sites in a static prototype system CO/Ni(100) at a standard DFT (GGA) level of theory, using a plane-wave basis and pseudopotentials. This validates its utility in analyzing ultrafast X-ray probe experiments. The accuracy of computed relative core level binding energies is about 0.2 eV, representing a lower limit for which spectral features can be resolved with this method. We also show that the commonly used Z +1 approximation gives very good core binding energy shifts overall. However, we find a discrepancy for CO adsorbed in the hollow site, which we assign to the significantly stronger hybridization in hollow bonding than in on-top.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Knut and Alice Wallenberg Foundation
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; KAW-2016.0042; FWP 100435
OSTI ID:
1688464
Alternate ID(s):
OSTI ID: 1712505; OSTI ID: 1769033
Journal Information:
AIP Advances, Vol. 10, Issue 11; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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