Abstract
Using single crystal adsorption calorimetry (SCAC), the coverage dependent
heats of adsorption and sticking coefficients for oxygen on Rh100
were measured. This is the first time that SCAC experiments have
been performed on a Rh crystal. In conjunction with results obtained
by other techniques, it is possible to assign different regimes in
the measured heat and sticking curves to different phases in the
adsorption process. These are identified with the formation of particular
adsorbate structures, namely the p(2�2) and the c(2�2) and (2�2)p4g
structures, respectively. The initial heat of adsorption was found
to be 386 kJ mol-1, and the initial sticking coefficient 0.74.
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