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Photodesorption of NO from Au(100) using 3D surface-velocity map imaging.

Abujarada, S and AlSalem, H and Chohan, UK and Draper, GL and Koehler, SPK (2016) Photodesorption of NO from Au(100) using 3D surface-velocity map imaging. Journal of Chemical Physics, 145 (18). ISSN 0021-9606

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Abstract

We measured the fully resolved 3-dimensional velocity distributions of nitric oxide photodesorbed from a gold single crystal. These experiments combine time-of-flight measurements and the velocity map imaging technique to yield velocity distributions resolved in three dimensions for a prototypical surface-adsorbate system. Nitric oxide adsorbed on Au(100) was photodesorbed using a 355 nm laser beam. The desorbed NO molecules were ionised in the gas-phase by resonance-enhanced multi-photon ionisation within a set of velocity map imaging optics. The NO molecules preferentially leave the surface along the surface normal with a very narrow angular distribution, indicating a non-thermal desorption process.

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