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Photochemical CH bond activation of methane on a Pt(111) surface

✍ Scribed by Yuri A. Gruzdkov; Kazuo Watanabe; Kyoichi Sawabe; Yoshiyasu Matsumoto

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
449 KB
Volume
227
Category
Article
ISSN
0009-2614

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✦ Synopsis

Methane adsorbed on a Pt ( 111) surface simply desorbs at x 70 K. However, after the methane-precovered surface is irradiated with 193 nm photons, the intensity of the thermal desorption peak decreases and a new peak of methane at w 260 K grows with the accumulated number of photons. This new desorption peak is attributed to recombination of CHs and H on Pt ( 111) .

It clearly indicates that methane on Pt( 111) is photodissociated to yield a chemisorbed CHr radical and an adsorbed H atom as products. The total cross section of photochemical processes is estimated to be 1.5X 1 O-l9 cm'.

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