Effects of vibrational and rotational excitations on the dissociative adsorption of O on Cu surfaces

Moritani, Kosuke*; Tsuda, Muneyuki*; Teraoka, Yuden; Okada, Michio*; Yoshigoe, Akitaka ; Fukuyama, Tetsuya*; Kasai, Toshio*; Kasai, Hideaki*

Oxygen molecules adsorbe dissociatively at Cu(111), Cu(110), and Cu(001) surfaces. The oxygen uptake curves were investigated by using supersonic molecular beam techniques and photoemission spectroscopy with synchrotron radiation. Adsorption probability increased with increasing translational kinetic energy of oxygen molecules. Vibrational and rotational levels of oxygen molecules were excited by elevation of nozzle temperature up to 1400 K keeping the incident energy of 0.5 eV. Although the adsorption probability increased with increasing nozzle temperature by 1000 K, it decreased inversely around 1400 K. These phenomena were interpreted as adsorption probability increase by vibrational excitation and decrease by rotational excitation.