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Adlayers of coadsorbed hydrogen (deuterium) atoms and methyliodide, H/CH(3)I, D/CH(3)I, H/CD(3)I, D/CD(3)I, were prepared on Ni (100) surfaces by absorption of methyliodide on hydrogen (deuterium) saturated surfaces at 120 K. Upon directing thermal D (H) atoms at these adlayers as gaseous products hydrogen and methane molecules were observed which consist of surface species only (eg H(2) and CH(4) in the combination: D-H/CH(3)I. The rates of formation of these products give evidence for reaction mechanisms in which absorbed atoms (eg H), activated by collisions with incoming atoms (eg D), react with surface species, either H or CH(3)I to form H(2) and CH(4). The reaction cross sections and isotope effects in H=D/CD(H)(3)I or D=H/CH(D)(3)I reactions support a collision model in which hot atoms act as mediators in the reaction pathways.

Additional information

Authors: KAMMLER T, Universität Bayreuth, Experimentalphysik III (DE);KÜPPERS J, Universität Bayreuth, Experimentalphysik III (DE);KUPPERS J, Universitat Bayreuth, Experimentalphysik III (DE)
Bibliographic Reference: Article: Journal of Chemical Physics, Vol. 107 (1997) No.1, pp. 287-290
Record Number: 199711290 / Last updated on: 1997-10-10
Original language: en
Available languages: en