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| Ionization Potential (eV) | Compound |
|---|---|
| 6.80-7.6a | Ferrocene |
| 7.63 (1st) | Nickel |
| 7.72 (1st) | Copper |
| 7.83 (1st) | Iron |
| 7.88 | Reserpine |
| 8.9 | Platinum |
| 12.6 | Water |
| 16.5 (2nd) | Iron |
| 30.0 (3rd) | Iron |
exact ionization potential depends on the substituents on the cylcopentadienyl ring.
