| Acronym | Meaning |
| CRL | Certified Reporting Limit |
| LHM | Longuet-Higgins-Murrell Approximation |
| EMI | Enriched Mantle Component 1 (of S. R. Hart |
| IAQMP | Indoor Air Quality Management Program |
| RCHF | Relaxed-core Hartree-Fock (approxn. In Calcns. On Mol. K-shell Excitation Spectra) |
| SDFFF | Sedimentation Field Flow Fractionation (particle Analysis) |
| LEAFS | Laser-Excited Atomic Fluorescence Spectrometry |
| PO | Projection Operator |
| ECDL | External-cavity Diode Laser |
| MCPN | Matrix Coherent Potential Approximation |