| Acronym | Meaning |
| HG-AAS | Hydride Generation-at. Absorption Spectroscopy |
| TRC | Total Residual Chlorine |
| DFP | Diisopropyl Fluorophosphate |
| IMPATT | Impact Avalanche Transit-time |
| QAC | Quaternary Ammonium Compound |
| FCCU | Fluidized Catalytic Cracking Unit |
| MBRS | Molecular Beam Reactive Scattering |
| DWA | Digital Waveform Acquisition |
| UNO-CAS | Unrestricted Natural Orbital-complete Active Space |
| ACPF | Averaged Coupled Pair Functional |