Characterization of mixed N2-layers on Ni(111) in the temperature range 20–100 K
1986; Elsevier BV; Volume: 178; Issue: 1-3 Linguagem: Inglês
10.1016/0039-6028(86)90348-1
ISSN1879-2758
AutoresM.J. Breitschafter, E. Umbach, D. Menzel,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe adsorption of molecular N2 on Ni(111) at very low temperatures ( ⩾ 20 K) has been investigated with various techniques such as XPS, UPS, Δφ, and TPD. Four differently bound N2 states in the first three layers could be distinguished, and coexistence of a physisorbed and a weakly chemisorbed species in the first layer was observed. Coadsorption experiments were performed to titrate adsorption sites and to study the interactions and exchange reactions between the different N2 states, and between these and rare gases in mixed adsorption layers. Adsorption, desorption, and conversion kinetics were studied, and conclusions about the nature of the precursor states could be derived, which are also observed in situ with photoemission.
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