| Acronym | Meaning |
| TCS | Total Current Spectroscopy |
| SCI | Single Excitation Configuration Interaction |
| RKRVL | Rydberg-Klein-Rees-Vanderslice-Lakshman (for Potential Energy) |
| SIMPLISMA | Simple-to-use Interactive Self-modeling Mixture Analysis |
| MLSS | Mixed Liquor Suspended Solids |
| ODU | Optical Density Units |
| ECS | Energy-corrected Sudden (scaling Theory In Mol. Collisions) |
| MDI | Modified Dipole Interaction(model For Mol.-polarizability Calcn.) |
| NESHAP | National Emission Standards For Hazardous Air Pollutants |
| PNDDO | Partial Neglect Of Diatomic Differential Overlap |