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首页> 外文期刊>The Journal of Chemical Physics >Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface
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Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

机译：从阶梯状铂（113）表面光解吸分子氧的热原子机理

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The photodesorption of oxygen admolecules was studied on a stepped Pt(113) = (s)2(111) x (001) surface with 193 nm irradiation at 110 K. Multidirectional desorptions were found to collimate at +/- 12 - 20 degrees and +/- 45 - 49 degrees off the surface normal and also along the surface normal in a plane along the trough. The first component is always dominant, and the weak second component only appears at higher oxygen coverages. The normally directed desorption is not significant. The translational energy of desorbing O-2 peaks around 15-20 degrees and 50 degrees, confirming the inclined desorptions. It is proposed that these inclined components are due to the desorption induced by the impact of oxygen admolecules with hot oxygen atoms from the photodissociation of adsorbed molecular oxygen, emitted along the trough. A simple cosine distribution was found to fit the thermal desorption from oxygen admolecules and also the recombinative desorption of oxygen adatoms. The 193 nm irradiation also produces additional, less tightly bound oxygen adatoms, which yield a desorption component collimated at 15 degrees from the surface normal in the step-down direction. (C) 1998 American Institute of Physics. [References: 51]
机译：在110 K的193 nm辐射下，在阶梯状Pt（113）=（s）2（111）x（001）的表面上研究了氧分子的光解吸。发现多向解吸在+/- 12-20度处准直，并且与表面法线以及沿着水槽的平面中的表面法线偏离+/- 45-49度。第一个成分始终占主导地位，而第二个弱成分仅在较高的氧气覆盖率下出现。通常定向的解吸并不重要。解吸的O-2的平移能在15-20度和50度左右达到峰值，证实了倾斜的解吸。提出这些倾斜的成分是由于沿水槽发射的吸附分子氧的光解离作用，由氧分子与热氧原子的碰撞引起的解吸所致。发现一个简单的余弦分布适合氧分子的热脱附以及氧原子的重组脱附。 193 nm辐照还会产生其他不那么紧密结合的氧原子，这些原子会产生一个解吸分量，该解吸分量在向下方向上与表面法线成15度准直。 （C）1998美国物理研究所。 [参考：51]

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