| Name | Eac, eV | ΔEac, eV |
| HM-I | 0.276 | 0.047 |
| HM-II | 0.615 | 0.387 |
| HM-III | 0.645 | 0.417 |
| HM-IV | 0.228 | 0 |
| HM-V | 0.398 | 0.170 |
| HM-VI | 0.366 | 0.138 |