AVS 49th International Symposium
    Surface Science Monday Sessions
       Session SS1-MoA

Paper SS1-MoA1
Bridging the Pressure Gap at the Atomic Level: CO/Pt(110) and CO/Pt(111)

Monday, November 4, 2002, 2:00 pm, Room C-108

Session: Surface Reactions: CO and NO
Presenter: E.K. Vestergaard, University of Aarhus, Denmark
Authors: E.K. Vestergaard, University of Aarhus, Denmark
P. Thostrup, University of Aarhus, Denmark
T. An, University of Aarhus, Denmark
B. Hammer, University of Aarhus, Denmark
F. Besenbacher, University of Aarhus, Denmark
Correspondent: Click to Email
We have studied the adsorption of CO on Pt(111)@footnote 1@ and Pt(110)@footnote 2@ over 12 orders of magnitude, up to 1 bar, using high-resolution scanning tunneling microscopy.@footnote 3@ Here we demonstrate the possibility of bridging the pressure gap for these systems at the atomic level. For both surfaces, our new high-pressure STM results show that the adsorbate structures formed at high CO pressures are identical to high-coverage structures observed at low temperatures under vacuum conditions. Our findings are at variance with previous STM results where it was concluded that new structures develop at the platinum surfaces at high CO pressures. From these and other pertinent cases we attempt to extract general directions for making conjectures as to the high-pressure response of chemisorption systems. @FootnoteText@ @footnote 1@ E. Kruse Vestergaard, P. Thostrup et al., submitted to Phys. Rev. Lett.@footnote 2@ P. Thostrup et al., Phys. Rev. Lett. 87, 126102 (2001)@footnote 3@ E. Laegsgaard, P. Thostrup et al., Rev. Sci. Instr. 72, 3537 (2001).