| Acronym | Meaning |
| ECCF | Equilibrium Charge-charge Flux (model In Ir Spectra Calcns.) |
| IMPATT | Impact Avalanche Transit-time |
| RPI | Radius Polydispersity Index |
| FP | Finite Perturbation |
| SGA | Symmetric Group Approach |
| APSG | Antisymmetrized Product Of Strongly Orthogonal Geminals (variant Of Multiconfiguration Self-consistent Field Method) |
| PPES | Photopyroelectric Spectroscopy |
| NPAR | Nonbinding Preliminary Allocation Of Responsibility |
| OHMTADS | Oil And Hazardous Materials Technical Assistance Data System |
| GIXAS | Grazing Incidence X-ray Absorption Spectroscopy |