Table 1. Extreme Points along Energy Curves of Representative Low-Lying States of H₂⁺, Including Minima and Maxima (If They Exist) Denoted as R_min and R_max, Respectively^a.

state	Rmin	Emin – ED	Rmax	Emax – ED
1sσ	2.0	–1.03 × 10–1
2pσ	12.5	–6.08 × 10–5
3dσ	8.8	–5.00 × 10–2
4fσ	20.9	–5.66 × 10–3
4dσ	17.8	–3.26 × 10–3	43.5	1.65 × 10–4
5gσ	23.9	–2.27 × 10–3
2pπ	7.9	–9.51 × 10–3	25.8	1.44 × 10–4

^aTheir energies, E_min and E_max, are shown relative to their respective dissociation limit E_D. Some states, such as 2sσ, 3pσ, and 3sσ, have neither maximum nor minimum and are not listed in the table. All values are in atomic units. Here we note that the shallow minimum of 2pσ has also been reported in ref (4).