Abstract
Using the reverse flash (RF) method, the sticking coefficient and binding energy of CO molecules on Rh(100) are obtained for CO surface densities up to 1.2 × 10 15 cm −2. The presence of weakly bound CO molecules with a binding energy of 0.34 eV is detected at n > 1.0 × 10 15 cm −2. Mass-to-charge-resolved retarding potential analysis of CO + emitted from Rh(100) is performed and absolute values of CO + field ion appearance energy obtained. By applying a thermionic cycle field-dependent values of the binding energy of CO Rh(100) at high coverages are obtained. A comparison of field-free (RF) results and field ion appearance energy spectroscopy (FIAES) data reveals the weakly bound (field-stabilized) CO layer as the origin of CO + field ions emitted from Rh(100) for field ion imaging.
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