The TOF spectrum of the fragmented ions for the dissociative ionization of CH4 by 54 eV electrons. The arrows denote the TOF for different ions with zero kinetic energy. The shaded areas represent the TOF condition windows for selection of CH4 +, CH3 +, H2 + background and H2 + ions from right to left, respectively, as discussed in the rest part of the paper.
The energy deposition distributions of CH4 + and CH3 +. The black (red) solid line is the Gaussian fit for the main peak of CH4 + (CH3 +). The data have been normalized to unity at the maximum.
(a) The KEDs of CH4 + and CH3 +, and (b) the KER for the formation of CH3 +.
(a) Energy deposition distribution of CHn +. The solid green triangles are the experimental result. The black dashed lines are the fitted Gaussian peaks and the red solid line is the sum of the fits. The center of each fitted peak is indicated by black vertical lines. (b) Two-dimensional plot for the ion yields as a function of the energy deposition (horizontal axis) and the TOF of the ion (vertical axis). The blue horizontal lines denote the TOF for different ions with zero kinetic energy.
Energy deposition distribution of H2 +. The red solid circles are the experimental result, while the black solid line is the Gaussian fit.
The energy deposition distributions of different ions.
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