| Acronym | Meaning |
| GWTR | Ground Water Treatment Rule |
| ASA | American Society Of Agronomy |
| MCQDPT2 | Second-order Multiconfigurational Quasi-degenerate Perturbation |
| SEPT | Secular Equation (with) Perturbation Theory |
| TAP | Temporal Anal. Of Products |
| PADMR | Photoinduced Absorption Detected Magnetic Resonance |
| 2PH TDA | Two-particle-hole Tamm-Dancoff Approximation (for Closed-shell |
| INQUA | International Association For Quaternary Research |
| ALMS | Atomic Line Molecular Spectroscopy |
| FEESP | Field-emitted Electron Spin-polarization |