| Acronym | Meaning |
| COSCAT | Coherent Scatter System |
| FEM | Free Electron Model |
| PMO | Perturbational Molecular Orbital |
| CRMGT | Channel Regulated MOS-gated Thyristor |
| BEFS | Berkeley Extreme And Far-UV Spectrometer |
| CHA | Chemical Hamiltonian Approach |
| CTA | Classical Trajectory Approximation (in Mol.-collision Calcns.) |
| MIES | Maximum Ionicity Excited State (model In Energy Calcn. Of Mols.) |
| SCLO | Self-consistent Local Orbital |
| QCP | Quantized Classical Path (method For Calcg. Quantum-mech. Rate Consts.) |