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Table 10

Ionisation energies and cross-sections of some typical ISM species.

Ionisation Ionisation
Species energy cross-section
[eV] [cm2]

Na I 5.14 7.7 × 10-20
Mg I 7.65 3.0 × 10-18
K I 4.34 8.9 × 10-21
Ca II 11.9 5.4 × 10-19



At ionisation energy.

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