Electron Damage of a CH3OH Layer Adsorbed on Nb(110)
Preliminary results on the electron damage of a CH3OH (methanol) layer adsorbed on Nb(110) studied by ESD, ELS and AES are presented. After methanol dosing and before the e− bombardment the ESD spectrum reveals H+ surface ions. Under e− bombardment the H+ surface ion current decreases exponentially with time to a constant value while the e− beam induced ESD O+ surface ion current increases linearly with time. Total ESD cross section determined from the H+ decay is 5.5×l0−19 cm2. The ion energy distribution experiments reveal two kinds of ions with most probable kinetic energy of 8 eV and 5 eV. The high energy peak shifts to the lower one as a function of e− dosing. The initial layer, mainly formed by methoxy species, is completely dissociated as O, H and C as a consequence of the electron bombardment.
KeywordsGraphite Hydroxyl Auger Methoxy Haas
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