| Acronym | Meaning |
| TID | Thermionic Ionization Detector |
| ICS | Intermittant Control Strategy |
| SUMER | Solar UV Measurements Of Emitted Radiation |
| PPGA | Plastic Pin Grid Array [electronic Package] |
| NRC | National Research Council |
| EDWBA | Exponential Distorted Wave Born Approximation |
| CPIMA | Center On Polymer Interfaces And Macromolecular Assemblies |
| PEEM | Panel Of Experts On Environmental Management |
| UNO-CAS | Unrestricted Natural Orbital-complete Active Space |
| ICF-CI | Interacting Correlated Fragment-CI (wave Function) (see Also SA-MCSCF) |