Главная – Журналы – Химия в интересах устойчивого развития 2003 номер 1

The electronic peculiarities of the Pt(100)–(1 x 1) surface effected by various adsorbates and interactions in adsorbed layer were studied by the Disappearance Potential Spectroscopy (DAPS). Two types of features were observed in DAPS spectra. The first type corresponds to an ordinary threshold excitation of platinum core electron to an available vacant state. These features are attributed to the substrate properties, and their positions are in good agreement with corresponding Local Density of States (LDOS) calculations. The second type of features new way of primary electron energy consumption – the conjugate electron excitation, which includes the above threshold transition of the substrate core electron, accompanied by excitation of the valence electron of adsorbed species to vacuum level. Positions of the respective spectral satellites are close to corresponding ionization potentials of a given species in adsorbed layer. Our experimental data show altogether more than 10 satellites, providing the evidence of reliability of the conjugate electron excitation process. The present results as a whole experimentally demonstrate the substantial unity of the substrate and adsorbate electronic structures.