Structure of adsorbed N2O on a Pt(111) surface and photodissociation at 193 nm: effective formation of oxygen adatoms
✍ Scribed by Kyoichi Sawabe; Yoshiyasu Matsumoto
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 527 KB
- Volume
- 194
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The structure of adsorbed N20 on a Pt ( 111) surface and its photochemistry at 193 nm have been studied by low energy electron diffraction and temperature-programmed desorption. NsO adsorbs on the Pt( 111) surface molecularly at 82 K and is not dissociated thermally. The observed LEED pattern indicates that one monolayer of N20 has a (3x3) structure with a fractional coverage of $ ML referenced to the Pt substrate. Adsorbed N20 molecules are dissociated with 193 nm photons and produce oxygen adatoms on the surface. The cross sections of total depletion and photodissociation of N20 are determined to be ( 1.4 t0.2) x 10-i* cm' and (7 + 1) x lo-i9 cm*, respectively. Atomic oxygen coverages of up to 0.75 ML are generated with photolysis of adsorbed N20 at 193 nm.