Bridging the pressure gap in surface science at the atomic level: H/Cu(110).
The structural response of the Cu(110) surface to H2 gas pressures ranging from 10(-13) to 1 bar is studied using a novel high-pressure scanning tunneling microscope (HP-STM). We find that at H2 pressures larger than 2 mbar the Cu(110) surface reconstructs into the ( 1x2) "missing-row" structure. From a quantitative analysis of the pressure dependence of the surface reconstruction, we conclude that Cu(110) responds identically to hydrogen at ultrahigh vacuum conditions and at atmospheric pressures. From the HP-STM data, we extract refined values for the adsorption and desorption rate constants.
Osterlund
L
L
Institute of Physics and Astronomy and CAMP, University of Aarhus, DK-8000 Aarhus C, Denmark.
Rasmussen
P B
PB
Thostrup
P
P
Laegsgaard
E
E
Stensgaard
I
I
Besenbacher
F
F