Adsorbate structure and angular dependence of desorption dynamics: molecular oxygen photodesorbed from palladium(111).
The O2 adsorbed on Pd(111) is photodesorbed and photodissociated when irradiated with 5.0 eV light. Polar and azimuthal angle-resolved time-of-flight spectra of directly photodesorbed neutral mols. were measured. Both desorption flux and the translational energy depend on the desorption angle. In particular, a marked max. in the translational energy at a polar angle of 60 Deg with C3v symmetry is found for the superoxo species. This behavior apparently is correlated with the binding geometry of the mols. before desorption.
Dieser Eintrag ist freigegeben.