| Acronym | Meaning |
| SCM | Shell-correction Method (in Calcns. For Metal Clusters) |
| MRD-CI | Multireference Double-excitation Configuration Interaction |
| PSNO | Pseudonatural Orbital |
| ESDMS | Electron Stimulated Desorption Mass Spectrometry |
| ISPGAA | In Situ Prompt Gamma-ray Activation Analysis |
| EDAX | Energy Dispersive Analysis Of X-rays |
| RDO | Reduced Density Operator |
| MNDOC | Modified Neglect Of Diatomic Overlap Correlated |
| APEX | Active Plasma Experiment Satellite |
| SCIA | Semiclassical Impact Approxn. (in Ionizing At. And Mol. Collision Calcns.) |