The Measurement of Absolute Surface Coverages Using Nuclear Reaction Analysis
The use of ion beam methods for determining the adsorbate coverage of single crystal surfaces can lead to absolute values with uncertainties less than 0.05 ML (1 ML = 1 monolayer ≃ 1015 atoms cm-2) in favourable cases. This accuracy arises from the availability of reliable nuclear reaction cross section data for light ions incident at MeV energies on low atomic number atoms, specifically H(D), C and O isotopes. Examples of such coverage measurements are given for CO/Pt(lll) at 185K assayed separately for C and O, O2/Ni(100) at 300K determined for both chemisorbed O16 and O18, and C2D4/Pt(lll) at 100K determined through measurements of both C and D.
KeywordsReaction Cross Section Cross Section Ratio Single Crystal Surface Thermal Desorption Spectroscopy Deuteron Energy
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