| Acronym | Meaning |
| ELS | Energy Loss Spectroscopy |
| LPAS | Laser Photoacoustic Spectroscopy |
| NELAP | National Environmental Laboratory Accreditation Program |
| OEP-SIC | Optimized Effective Potential Self-interaction Correction |
| MPNO | Molecular Pair Natural Orbital |
| PCS | Photon Correlation Spectroscopy |
| MR-L-CEPM | Multireference-linearized-coupled Electron Pair Method |
| HEPES | N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic Acid |
| HG-AAS | Hydride Generation-at. Absorption Spectroscopy |
| BIF | Boilers And Industrial Furnaces (USEPA Rule) |