| Acronym | Meaning |
| ARIPES | Angle-resolved Inverse Photoemission Electron Spectroscopy |
| QSM | Quantum-statistical Model |
| FOPIM | First Order Perturbation Iteration Method |
| BOA | Bond Orbital Approximation |
| APRF | Acute Phase Response Factor |
| FEG | Field Emission Gun |
| MET | Many Electron Theory (for Singlet Ground State) |
| RPI | Radius Polydispersity Index |
| AA | Activation Analysis |
| ECT | Ergodic Collision Theory |