High density molecular beam produced by a multichannel nozzle

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Abstract
A comparative study of gaseous beams used as targets in collision experiments is presented for two different kinds of nozzles. The angular spread of the beam at the nozzle output and the density distribution along the beam axis was measured by an electron diffraction method. The second step was to show the formation of clusters in the beam by increasing the pushing pressure. This was done by a measurement of the differential elastic cross section as a function of the scattering angle. The results show a better spatial localization and a higher density of the beam when obtained by the multichannel nozzle. Also the cluster formation in such a beam is less probable than in a free expansion beam.

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