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SUMMARY:Electron Energy Loss Spectroscopy of CO\, O2\, and H2 Adsorbed on 
 Au-Ni(111)
DTSTART:20160317T163000
DTEND:20160317T173000
DTSTAMP:20260916T044002Z
UID:53f7ca064a32fe275b80f7adedca05494631077291cea077522fd40d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Christopher Leon\nPostdoctoral Fellow Ceyer Group\nSurface
  Science at MIT - Department of Chemistry\nThe adsorptive behavior of CO\,
  O2\, and H2 on Au‑Ni(111) surface alloys is investigated as a function 
 of surface Au coverage\, up to 0.79 ML Au.  Vibrational spectra (obtained
  via high-resolution electron energy loss spectroscopy) of Au‑Ni(111) su
 bject to saturation exposures of CO\, O2 and H2 at 77 K reveal new adsorpt
 ion states identifiable by the internal vibrational stretch frequency of m
 olecularly adsorbed species.  These include: CO adsorption at Ni-bridge (
 1960 cm‑1)\, Ni-atop (2110 cm‑1)\, and Au‑atop (2160 cm‑1)\; and O
 2 adsorption at bridge (856 cm‑1) and fcc/hcp hollows (743\, 957 cm‑1)
  with sensitivity to subsurface atoms.  There is also evidence for H2 dis
 sociative adsorption leading to subsurface interstitial site population (7
 50\, 820 cm-1).  An analysis of the adsorption site occupation fractions 
 leads to self-consistent structural models of the Au-Ni(111) surface alloy
 .  The stability of these chemical species normally absent on Ni(111) can
  be explained by considering changes to the d-band center due to alloying\
 , and structural effects induced by an accompanying complex surface recons
 truction.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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