| Acronym | Meaning |
| FES | Field Emission Spectroscopy |
| APUMPN | Approximately Projected Unrestricted Moeller-Plesset Nth-order |
| MBRSPT | Many-body Rayleigh-Schroedinger Perturbation Theory |
| DIOP | Diisooctyl Phthalate |
| PPT | Parts Per Trillion |
| MOBK | Modified Oppenheimer-Brinkman-Kramers (approxn. In Calcns. On Atomic And Molecular Collisions With Ions) |
| UKB | Unrestricted Kinetic Balance (in Calcns. Of Wave Functions And Energies) |
| GPS | Global Positioning System |
| ZVI | Zero-valent Iron |
| CCI | Complete Configuration Interaction |