http://scitation.aip.org/content/aip/journal/jcp/101/12/10.1063/1.467850
Direct reaction of gas‐phase atomic hydrogen with chemisorbed hydrogen on
Ru(001)
T. A.
Jachimowski<http://scitation.aip.org/content/contributor/AU0666706;jsessionid=35ucjlhs7rg8q.x-aip-live-03>
1 and W. H.
Weinberg<http://scitation.aip.org/content/contributor/AU0332482;jsessionid=35ucjlhs7rg8q.x-aip-live-03>
1
[image: +] View Affiliations
J. Chem. Phys. 101, 10997 (1994); http://dx.doi.org/10.1063/1.467850
The adsorption of gas‐phase atomic hydrogen on the Ru(001) surface results
in a saturation coverage of 1.42 hydrogen adatoms per primitive surface
unit cell, which may be compared with a saturation coverage of one hydrogen
adatom per primitive surface unit cell in the case of dissociative
chemisorption of molecular hydrogen. The observed saturation fractional
coverage of 1.42 results from a steady‐state balance of adsorption of
gas‐phase atomic hydrogen and reaction of gas‐phase hydrogen with
chemisorbed hydrogen adatoms, which produces molecular hydrogen that
desorbs from the surface at a temperature at least 150 K below the
temperature of recombinative desorption of two hydrogen adatoms. The cross
section of this direct reaction of hydrogen was found to be remarkably
large, approximately 40% of the cross section for chemisorption of the
gas‐phase atomic hydrogen. The reaction was found not to depend on surface
temperature nor was there an observable kinetic isotope effect.
© 1994 American Institute of Physics
