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EPJ Techniques and Instrumentation
Figure 7 | EPJ Techniques and Instrumentation

Figure 7

From: Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°

Figure 7

Schematic view of the setup. Electrons (dotted lines) are created in the photoemission gun in a separate vacuum chamber (left), focused on the aperture (a) and guided to the interaction region by a magnetic field (solid line). The supersonic helium jet (dashed line) is created by two skimmers after a nozzle (b) and crosses the electron beam inside the variable potential interaction region (c), where it is additionally collimated by a third aperture. Excited target atoms are detected by an MCP with delay line anodes at the bottom (d), allowing precise measurement of the deflection after the electron impact.

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