Valence-Band States of Ion-Bombarded Polystyrene
Ion-bombarded polystyrene with a 0.5-keV Ar+ beam has been investigated by means of photoelectron spectroscopy performed with synchrotron radiation. After a dose of 10(15) ions/cm2 the evolution of the valence band of the bombarded sample towards an amorphous carbonlike configuration is reported. From the analysis of valence-band spectra we estimated the out-diffusion of hydrogen and showed that its electronic states remain well identified and stable until the hydrogen presence is about 35% with respect to the pristine sample. Finally, comparison with mass spectroscopy measurements on deuterated polystyrene has been performed to determine hydrogen evolution during the ion irradiation.
Univ catania,dipartmento fis,i-95129 catania,italy. univ wisconsin,ctr synchrotron radiat,stoughton,wi 53589. ecole polytech fed lausanne,phb ecublens,dept phys,ch-1015 lausanne,switzerland. Terrasi, a, cnr,ist metodol & tecnol microelettr,corso italia 57,i-95129 catania,italy.
ISI Document Delivery No.: GA100
Record created on 2006-10-03, modified on 2016-08-08