The surface composition of the H 2 SO 4 /H 2 O binary system in the temperature range (298−170 K) has been studied using differentially pumped Auger electron and X-ray photoelectron spectrometers designed to perform under equilibrium conditions ( P H 2 O ≈ 10 -6 −10 -4 Torr). Both spectroscopies have been calibrated on pure sulfuric acid solutions to illustrate their ability to provide accurate atomic stoichiometries within the near-surface region. In the case of AES this ability has also been extended as a tool for the study of the surface composition in the H 2 SO 4 /H 2 O binary system under equilibrium conditions. Compositional analysis of this acidified surface indicates that under these experimental conditions the chemical compositions of the bulk and near-surface region are equal within experimental error. Mass spectrometric analysis of the vapor composition indicates equilibration between the acid solution and D 2 O.
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Fairbrother et al. (1996) studied this question.
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