| Acronym | Meaning |
| PSD | Position Sensitive Detector |
| SDTQ-MBPT | Single-double-triple-quadruple Excitation (contribution) MBPT |
| NSSN | National Standards Systems Network |
| MCEP | Multiconfigurational Electron Propagator (in Ionization Potential Calcns.) |
| AAO | Amino Acid Oxidase |
| CCC | Counter Current Chromatography |
| RASSI | Restricted Active Space State Interaction |
| EDA | Ethylene Diamine |
| NICS | Nucleus-independent Chemical Shifts |
| FAO | Food And Agriculture Organization |