| Acronym | Meaning |
| CIOS | Complex Infinite Order Sudden (approxn. In Quantum Calcns.) |
| APXPS | Appearance Potential X-ray Photoemission Spectroscopy |
| HIPE | High Internal Phase Emulsion |
| PMAMS | Patterned Multi-array |
| FPPC | Float Program Planning Committee |
| BIC | Bragg Ionization Chamber |
| ELS | Energy Loss Spectroscopy |
| LPG | Liquefied Petroleum Gas |
| VCC | Variable Curvature Coordinates (in Calcns. On Mol. Vibrations) |
| MRSD-CI+P | MRSD-CI (with) Pople Correction |