| Acronym | Meaning |
| HSEES | Hazardous Substances Emergency Events Surveillance |
| MCRRPA | Multiconfiguration Relativistic Random Phase Approxn. |
| TCSPC | Time-correlated Single-photon Counting |
| UATMP | Urban Air Toxics Monitoring Program |
| HWRAP | Hazardous Waste Remedial Actions Program |
| CHES | 3-(cyclohexylamino)ethylsulfonic Acid |
| PDS | Photothermal Deflection Spectroscopy |
| KSA | Kirkwood Superposition Approximation |
| SCSA | Small-curvature Semiclassical Adiabatic (approxn. For Mol. Energy Levels) |
| BOA | Born-Oppenheimer Approxn. |