INFLUENCE OF ELECTRON INTERACTION ON THE CHEMISORPTION OF CO ON NB(110)

In this work we study the chemisorption of CO on Nb (110) surface unde r electron bombardment at 240 K using Auger electron spectroscopy, AES , and electron energy loss spectroscopy, EELS, techniques. Electron bo mbardment proves to be very effective in growing a carbon layer due to the high yield of depopulated 0 atoms by electron-stimulated desorpti on. The energy of primary electrons has a significant influence on the rate of carbon accumulation. Low energy electrons, about 250 eV, reve al EELS spectra quite different from those produced by 2000 eV electro ns in both structure and intensify.