Oxygen adsorption study on Rh(100) surface by electron-stimulated desorption spectroscopy

Adsorption states of oxygen on a Rh (100) surface have been studied by electron-stimulated desorption (ESD) spectroscopy. The ESD measurement was performed time sequentially during exposure of the surface to oxygen and heating of the surface. At least three adsorption states were distinguished for oxygen by ESD. One state gave no ESD ions at low temperature. The other two states gave ESD oxygen ions of different kinetic energies. The yield of ESD oxygen ions changed drastically at 350 and 500 K. Decrease of oxygen on the surface was clearly observed above 600 K in hydrogen gas.