Abstract
A study via infrared and X-ray-photoelectron spectroscopies of ethylene reactions with porous silica during high-energy (300 keV) argon bombardment in a C 2H 4 atmosphere, followed by exposure to air at room temperature or heating at 500°C in a vacuum, is reported. This study has revealed in the as-prepared sample the presence of CC, CO, CH 2 and CH 3 groups. Aging at room temperature in a nitrogen atmosphere as well as in air produced an increase of CH 3 and CO amount, while a heat treatment at 500°C produced the following: the disappearance of CC and CO groups, an increase in the CH 2 amount, and a decrease in the CH 3 amount. An interpretation for this behaviour is proposed. A previous conclusion concerning CO 2 addition to ion-bombarded porous silica, that approximately 10 2 oxygen-bridge vacancy per impinging ion are stabilized through the addition of gas molecules, is confirmed by the present work.
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