COADSORPTION AND REACTION OF WATER AND POTASSIUM ON AG(111)

KOH formation on Ag(111) has been studied with UPS, XPS, TPD, AES, isotopic exchange, and work function measurements. O(1s) XPS indicates that coadsorbed potassium and water react very slowly at 100 K at submonolayer and multilayer K precoverages. D2 and D2O TPD spectra of K + D2O layers provide evidence for KOD formation and decomposition temperatures, as well as the desorption temperatures of water that hydrates KOD. UPS, XPS, and TPD indicate that KOD formation is complete at 300 K. In TPD of H2O on KOD, D-for-H exchange is observed. KOH layers are altered by exposure to a 3-keV electron beam. © 1990 American Chemical Society.