| Acronym | Meaning |
| IEG | Immediate Early Gene |
| DRF | Direct Reaction Field (for Intermol. Interactions) |
| ROA | Relaxed Orbital Approximation |
| SMO | Statistical Model Of Overlap |
| LEED | Low-energy Electron Diffraction |
| LED | Longitudinal Eddy Current Delay |
| SCEM | Semiclassical Self-consistent Eikonal Method |
| DBPR | Microbiological And Disinfection Byproducts Regulations |
| NCAT | National Catalog Database (accessible Through OLS) |
| GFEMO | Generalized Free Electron Molecular Orbital |