Pulsed molecular beam reactive scattering

Characterization and analysis are performed using the following surface science techniques temperature programmed desorption/reaction (TPD/TPR), pulsed molecular beam reactive scattering (pMBRS) (IRRAS), metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS) and auger electron spectroscopy (AES). First the experimental setup is briefly described, followed by the support preparation and characterization as well procedures utilized in this work. These descriptions include a concise introduction to the underlying physical principles of the applied techniques (including experimental details). 

Molecular Beam Reactive Scattering Using Pulsed Molecular Beams... 

Steady state has to be reached and this requirement is not necessarily fulfilled with pulsed beams of narrow temporal width. Also the laser beam section has to be greater than the reaction zone, indeed if it is smaller, molecules produced outside the irradiated volume and scattered into it are counted. Qearly in our case the product densities n(v ,K") in the irradiated volume are dependant on the outcome of previous outside reactive collisions. We have therefore developed a simple realistic model to evaluate the correction function defined by the spatial and temporal overlap of the molecular beams. 

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