Cross sections for electron impact ionization of Ar7+ . The absolute uncertainty is ±12% for the measured data and ±20% for the corrected data at the two-standard-deviation level for a typical point near the peak cross section. Reference: Y. Zhang et al., Phys. Rev. A 45, 2929 (1992).

                                     Ionization cross sections
                                           (10-18 cm2)
         Electron energy
              E (eV)            Measured data        Corrected* data
               18.1             26.63 ± 4.34          -2.29 ± 8.21
               28.8             18.15 ± 2.41           1.30 ± 4.73
               48.0             11.24 ± 1.41           2.25 ± 2.87
               73.8              4.23 ± 0.67          -0.83 ± 1.88
               97.2              0.81 ± 0.44          -0.58 ± 1.49
              122.3              2.91 ± 0.40           0.56 ± 1.27
              170.2              3.11 ± 0.69           1.82 ± 1.18
              195.0              1.83 ± 0.14           0.87 ± 0.89
              243.0              1.56 ± 0.21           1.02 ± 0.80
              267.1              1.76 ± 0.26           1.37 ± 0.77
              291.8              1.83 ± 0.29           1.56 ± 0.75
              364.3              3.19 ± 0.23           3.16 ± 0.64
              390.0              3.28 ± 0.29           3.31 ± 0.65
              413.0              3.45 ± 0.20           3.53 ± 0.59
              440.0              2.99 ± 0.26           3.12 ± 0.60
              489.0              3.21 ± 0.24           3.40 ± 0.56
              538.0              3.09 ± 0.36           3.33 ± 0.60
              561.0              3.51 ± 0.22           3.78 ± 0.52
              586.9              3.04 ± 0.08           3.32 ± 0.46
              593.6              2.91 ± 0.13           3.20 ± 0.47
              643.5              2.77 ± 0.23           3.10 ± 0.49
              692.7              2.88 ± 0.18           3.22 ± 0.45
              742.3              2.76 ± 0.17           3.13 ± 0.43
              792.1              2.94 ± 0.16           3.32 ± 0.42
              840.0              3.07 ± 0.27           3.46 ± 0.46
              890.0              2.85 ± 0.23           3.25 ± 0.43
              988.0              2.56 ± 0.23           2.99 ± 0.41
             1087.0              2.31 ± 0.22           2.75 ± 0.39
             1186.0              2.20 ± 0.22           2.64 ± 0.38

* The data have been corrected for below-threshold apparent signal which is assumed to be due to a combination of spurious space charge effects and excitation autoionization from highly metastable ions.

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Last Modified: Friday, January 10, 1997