Velocity and angular distributions of H2 (v=1, J=1) scattered from Cu (110) and Cu (111)

M. Gostein; Greg O. Sitz

doi:10.1117/12.220852

Abstract

The scattering of vibrationally and rotationally state-selected H₂ from Cu(110) and Cu(111) surfaces has been studied. Stimulated Raman scattering is used to pump a fraction of the incident flux in a supersonic beam of H₂ into the J equals 1 rotational state of the first excited vibrational state. Resonance-enhanced multiphoton ionization (REMPI) is used to detect incident and scattered H₂ in this state. Time-of-flight spectra are recorded as a function of the distance from the REMPI probe to the surface and scattering angle. These data are fit to a model whose parameters describe the velocity and angular distribution of the scattered molecules. The model permits a determination of flux from the density-sensitive measurements. Its use to derive a quantitative estimate of the absolute survival probability for the pumped state is discussed.

Citation Download Citation

M. Gostein, M. Gostein, Greg O. Sitz, Greg O. Sitz, "Velocity and angular distributions of H2 (v=1, J=1) scattered from Cu (110) and Cu (111)", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); doi: 10.1117/12.220852; https://doi.org/10.1117/12.220852

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