SURFACE PHOTOCHEMISTRY - PRODUCTS RETAINED ON PT(111) DURING PHOTOLYSIS OF ADSORBED CH3BR

被引:66
作者
ZHOU, Y [1 ]
FENG, WM [1 ]
HENDERSON, MA [1 ]
ROOP, B [1 ]
WHITE, JM [1 ]
机构
[1] UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712
关键词
GASES - Surfaces - MOLECULES - ORGANIC COMPOUNDS - Photolysis - SOLIDS - Surfaces;
D O I
10.1021/ja00221a074
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this communication we identify, using vibrational spectroscopy, the adsorbed species formed during UV irradiation of CH//3Br on Pt(111). By comparison with measurements on CH//3I, which thermally decomposes to CH//3(a) and I(a), we identify adsorbed methyl as the hydrocarbon fragment formed and retained during the photolysis. The results show that the photolysis of submonolayer amounts of methyl bromide, adsorbed on Pt(111), leads to adsorbed methyl groups. These have a C//s symmetry and are the precursor to the methane observed in post-irradiation TPD. Methane formation involves background H//2 chemisorption and some methyl decomposition.
引用
收藏
页码:4447 / 4448
页数:2
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