| Acronym | Meaning |
| HEM | Human Exposure Model |
| EBEBO | Extended Bond Energy Bond Order (quantum Calcn. Method) |
| APR | Acoustic Paramagnetic Resonance |
| PCA | Polar Cap Absorption |
| RFT | Respirator Fit Test |
| CSH | Centrifugal Sudden Hyperspherical (coordinate Reactive Scattering Code) |
| HFPP | Hartree-Fock Pseudopotential |
| LCGTO-MCP-LS | Linear Combination Of Gaussian-type Orbitals-model Core Potential-local Spin Density |
| DWBE | Distorted-wave Born (approxn. With) Exchange |
| HSD | Hyperspherical Diabatic (wave Functions) |