| Ion | IP (eV) | Reference | ||
| Xi | Xi-1 | Xi | Trans. prob. | Coll. str. |
| O+ | 13.62 | 35.12 | [1] | [2] |
| S+ | 10.36 | 23.34 | [3], [4] | [5] |
| Cl2+ | 23.8 | 39.9 | [3] | [6] |
| Ar3+ | 40.74 | 59.81 | [3] | [7] |
| References: [1] Zeippen (1982), [2] Pradhan (1976), [3] Mendoza & Zeippen (1982), [4] Keenan et al. (1993), [5] Keenan et al. (1996), [6] Butler & Zeippen (1989), [7] Ramsbottom et al. (1997). |