Colin Harthcock - Orientation--Free and Differentially Pumped Addition of a Low-Flux Reactive Gas Beam to a Surface Analysis System

Document created by Colin Harthcock on Aug 30, 2016
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  We describe an example of a piecewise gas chamber that can be   customized to

  incorporate a low 

  ux of reactive gas-phase radicals with an existing surface   analysis

  chamber for in-situ and stepwise gas-surface interaction   experiments without any

  constraint in orientation. This open design provides complete   angular freedom and

  easy alignment in assembling this gas chamber using a   commercially available gas

  source. In addition, the entire gas-surface system is readily   dierentially pumped

  with the surface chamber kept under ultra-high-vacuum during the   gas-surface

  measurements. The piecewise nature of this gas chamber should   allow not only

  straightforward reconstruction to accommodate to the orientation   of dierent surface

  chambers, but for the addition of other desired features, such as   additional pumping,

  to the current conguration. Stepwise interaction between atomic   oxygen and a highly

  ordered pyrolytic graphite surface was chosen to test the   eectiveness of this design,

  and the site-dependent O-atom chemisorption and clustering on the   graphite surface

  was resolved by a scanning tunneling microscope in the nm scale.   X-ray photoelectron

  spectroscopy was used to further conrm the chemisorption of   oxygen atoms on the

  graphite surface.

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