Cross-Section Calculations for Electron-Impact Ionization of Pyrimidine Molecule and Its Halogenated Derivatives: 2-Chloropyrimidine, 5-Chloropyrimidine, 2-Bromopyrimidine and 5-Bromopyrimidine.

Since, as can be seen in Figure 2 , there are quite significant discrepancies between the predictions of theoretical calculations and the results of various experiments, an important question is which of these results is the most realistic.

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