| Acronym | Meaning |
| TOP | Trioctyl Phosphate |
| PTM | Perturbation Trajectory Method (in Gas-surface Collision Dynamics) |
| TAGGSI | Transfer Of Aerosols And Gases To The Greenland Snow And Ice |
| IPT | Iterated Perturbation Theory |
| VBSCF | Valence Bond Self-consistent Field |
| TRLFS | Time Resolved Laser Fluorescence Spectroscopy |
| FEL | Free Electron Laser |
| FRDS | Federal Reporting Data System |
| LPAS | Laser Photoacoustic Spectroscopy |
| SHOA | Second-harmonic Optical Activity |