| Acronym | Meaning |
| NLLS | Nonlinear Least Squares |
| ETSAP | Energy Technology Systems Analysis Program |
| CDRE | Convolution Difference Resolution Enhancement |
| ATA | Average T-matrix Approximation |
| MCM | Multiconfigurational (variation Of) Moments (for Mo Correlation Diagrams Calcn.) |
| OTS | Office Of Toxic Substances (USEPA) |
| LR-SCF | Low-rank SCF |
| ECS | Energy-corrected Sudden (scaling Theory In Mol. Collisions) |
| PIO | Paired Interaction Orbital |
| PHIP | Para-Hydrogen Induced Polarization |