Abstract
The oxidation of benzaldehyde on bulk copper substrates is investigated by XPS and static SIMS. The difficulties in interpreting the XPS data are discussed. Static SIMS gives information on the adsorbate molecular structure, though copper substrates give extensive cationization. Benzoate ion was a major feature in the negative SIMS spectrum, and gave direct evidence for the oxidation of the adsorbate. Restricting the amount of oxygen in the system produced minor changes in the SIMS spectrum of the adsorbate, in contrast to the marked effect noted previously for aluminium substrates.
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