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Ion and velocity map imaging for surface dynamics and kinetics

机译:表面动力学和动力学的离子和速度映射成像

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We describe a new instrument that uses ion imaging to study molecular beam-surface scattering and surface desorption kinetics, allowing independent determination of both residence times on the surface and scattering velocities of desorbing molecules. This instrument thus provides the capability to derive true kinetic traces, i.e., product flux versus residence time, and allows dramatically accelerated data acquisition compared to previous molecular beam kinetics methods. The experiment exploits non-resonant multiphoton ionization in the near-IR using a powerful 150-fs laser pulse, making detection more general than previous experiments using resonance enhanced multiphoton ionization. We demonstrate the capabilities of the new instrument by examining the desorption kinetics of CO on Pd(111) and Pt(111) and obtain both pre-exponential factors and activation energies of desorption. We also show that the new approach is compatible with velocity map imaging. Published by AIP Publishing.
机译:我们描述了一种使用离子成像来研究分子束表面散射和表面解吸动力学的新仪器,允许独立测定解吸分子的表面和散射速度的停留时间和散射速度。 因此,与先前的分子束动力学方法相比,该仪器提供了衍生真正的动力学迹线,即产品磁通量与停留时间,并允许显着加速数据采集。 该实验利用强大的150-FS激光脉冲在近红外进行非共振多光电电离,比使用共振增强多光电电离的先前实验更通用。 我们通过检查PD(111)和PT(111)上的CO的解吸动力学来展示新仪器的能力,并获得预指数因素和解吸的激活能量。 我们还表明新方法与速度映射成像兼容。 通过AIP发布发布。

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