Dissociative adsorption of methane on Pt(111) induced by hyperthermal collisions

Darren J Oakes, Martin McCoustra, Michael A Chesters

Research output: Contribution to journalArticle

Abstract

Measurements have been made of the dissociative adsorption of methane on a Pt(111) surface at surface temperatures of 150 and 550 K using hyperthermal beam techniques. Sticking coefficient measurements made at 550 K are in close agreement with existing literature data. Measurements made at 150 K extend our understanding of the dissociative sticking of methane into a new, low-temperature regime. Reflection-absorption infrared (RAIR) spectral measurements made at 150 K definitively identify the primary product of the dissociative adsorption as the methyl (CH3) moiety. The thermal evolution of this moiety has subsequently been followed by RAIRS and temperature-programmed desorption (TPD). The observation of the C2 ethylidyne moiety at temperatures above 300 K provides clear evidence for the formation of C-C bonds during the thermal chemistry of the methyl moiety.
Original languageEnglish
Pages (from-to)325-336
Number of pages12
JournalFaraday Discussions
Volume96
DOIs
Publication statusPublished - 1993

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