| Acronym | Meaning |
| CBO | Crude Born-Oppenheimer (wave Functions) |
| RAF | Reactivity Adjustment Factor |
| NACCA | North American Council Of Chemical Associations |
| CCD | Coupled-cluster Doubles |
| BTDA | 3,3',4,4'-benzophenonetetracarboxylic Dianhydride |
| PRECP | Processing Emissions By Cloud And Precipitation (DOE Program) |
| TDHF | Time-dependent Hartree-Fock Method |
| FDCD | Fluorescence Detected Circular Dichroism |
| MSA | Methanesulfonic Acid (air Pollutant) |
| CEMS | Conversion Electron Moessbauer Spectroscopy |