(Color online) Schematic of the experimental setup.
Scaled schematic of the ion optics for velocity map imaging (all dimensions are in millimeters).
Block diagram for the data acquisition system.
Ion yield curve for the formation of from by DEA. The arrows represent the electron energies where the velocity map images are reported.
Time-of-flight mass spectrum of from taken at 6.5 eV.
(Color online) Time sliced velocity map images of from at three different electron energies. The left panel shows a two-dimensional pattern we obtained after time slicing. The electron beam direction is vertically down. The right panel shows the corresponding three-dimensional distribution with intensity as the axis. These distributions have been rotated through 35 deg in the counter clockwise direction.
(Color online) Angular distribution of from . The squares, circles, and triangles are the data at electron energies of 5.0, 6.5, and 8.0 eV respectively.
(Color online) Comparison of the angular distribution of ions from using velocity map imaging with those obtained using a conventional technique. The open squares, circles, and triangles are the data at electron energies of 5.57, 6.70, and 7.80 eV, respectively, from Ref. 13 and the filled squares, circles, and triangles are the present data at electron energies 5.0, 6.5, and 8.0 eV respectively.
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