No Binding Energies To And Diffusion Barrier On Pd Obtained With Velocity-Resolved Kinetics

We report nitric oxide (NO) desorption rates from Pd(111) and Pd(332) surfaces measured with velocity-resolved kinetics. The desorption rates at the surface temperatures from 620 to 800 K span more than 3 orders of magnitude, and competing processes, like dissociation, are absent. Applying transition state theory (TST) to model experimental data leads to the NO binding energy E-0 = 1.766 +/- 0.024 eV and diffusion barrier D-T = 0.29 +/- 0.11 eV on the (111) terrace and the stabilization energy for (110)-steps Delta E-ST = 0.060(-0.030)(+0.015) eV. These parameters provide valuable benchmarks for theory.