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A novel gas-vacuum interface for environmental molecular beam studies

Artikel i vetenskaplig tidskrift
Författare Sofia M. Johansson
Xiangrui Kong
Panos Papagiannakopoulos
Erik S Thomson
Jan B. C. Pettersson
Publicerad i Review of Scientific Instruments
Volym 88
Nummer/häfte 3
ISSN 0034-6748
Publiceringsår 2017
Publicerad vid Institutionen för kemi och molekylärbiologi
Språk en
Länkar doi.org/10.1063/1.4978325
Ämnesord in-situ, water accommodation, collision dynamics, covered ice, surfaces, simulations, temperature, graphite, liquid, system, Instruments & Instrumentation, Physics
Ämneskategorier Kemi, Fysik

Sammanfattning

Molecular beam techniques are commonly used to obtain detailed information about reaction dynamics and kinetics of gas-surface interactions. These experiments are traditionally performed in vacuum and the dynamic state of surfaces under ambient conditions is thereby excluded from detailed studies. Herein we describe the development and demonstration of a new vacuum-gas interface that increases the accessible pressure range in environmental molecular beam (EMB) experiments. The interface consists of a grating close to a macroscopically flat surface, which allows for experiments at pressures above 1 Pa including angularly resolved measurements of the emitted flux. The technique is successfully demonstrated using key molecular beam experiments including elastic helium and inelastic water scattering from graphite, helium and light scattering from condensed adlayers, and water interactions with a liquid 1-butanol surface. The method is concluded to extend the pressure range and flexibility in EMB studies with implications for investigations of high pressure interface phenomena in diverse fields including catalysis, nanotechnology, environmental science, and life science. Potential further improvements of the technique are discussed. Published by AIP Publishing.

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