Ma. Huels et al., QUENCHING OF THE DISSOCIATIVE ELECTRON-ATTACHMENT RESONANCES OF O2 PHYSISORBED ON AMORPHOUS ICE, Chemical physics letters, 210(4-6), 1993, pp. 340-346
Measurements of electron stimulated desorption (ESD) yields of O-, at
incident electron energies below 20 eV, from 0.15 monolayers (ML) of O
2 physisorbed at 20 K on a variety of molecular solids have been perfo
rmed. It is observed that for O2 condensed on 4 ML of H2O, the O- sign
al from dissociative electron attachment (DEA) to O2 is entirely absen
t. We attribute this to a complete quenching of the dissociative 2PI(u
), 2SIGMA(g)+, and 2SIGMA(u)+, resonances of O2- by the adjacent water
molecules.