| Acronym | Meaning |
| IMPATT | Impact Avalanche Transit-time |
| TRACS | Trends In Atmospheric Constituents Study |
| OCBSE | Orthogonality Constrained Basis Set Expansion Prodedure |
| PIRI | Photoinduced Rydberg Ionization |
| FTICRMS | Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
| SIM | Standards Injection Module |
| SFV | Semliki Forest Virus |
| ADE | Adverse Drug Event |
| RTPM | Radical Triplet Pair Mechanism |
| QCISD | Quadratic Configuration Interaction With Single And Double Excitation |