Temperature programmed desorption of Bi on Ni(100)

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576725· OSTI ID:6788039

Jones, M E; Heitzinger, J M; Smith, R J; Koel, B E ^[1]

---

1. Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO (USA) Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, CO (USA)

The temperature programmed desorption (TPD) spectra of Bi from Ni(100) are characteized by a large shift of the desorption maximum to lower temperatures with increasing coverage. Similar behavior is observed for the desorption of Bi from other metal substrates. Analysis of the desorption of Bi from Ni(100) was performed to determine the kinetic order of desorption and the energetics of the Bi--Ni interaction. We find that Bi desorption is described well by first-order kinetics with a strong coverage dependence of the activation energy of desorption {ital E}{sub {ital d}}. The value of {ital E}{sub {ital d}} varies from 70 kcal mol{sup {minus}1} at low Bi coverage to 57 kcal mol{sup {minus}1} for monolayer Bi coverage. We discuss the possible role of Bi{sub 2} in the desorption process and also report the effect of coadsorbed oxygen on the Bi TPD spectrum and the Bi--Ni interaction.

• OSTI ID: 6788039
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN 0734-2101; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ADSORPTION
BISMUTH
DESORPTION
DIMERS
ELEMENTS
ENERGY
METALS
NICKEL
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TRANSITION ELEMENTS