| Acronym | Meaning |
| ASI | Advanced Study Institute (NATO) |
| PIERS | Polarized Infrared External Reflection Spectroscopy |
| NK | Natural Killer |
| REOM | Reduced Equations Of Motion (method In Mol.-scattering Calcns.) |
| DVR | Discrete Variable Representation (in Wave Function Calcn.) |
| NAL | No Action Level |
| NPSSMO | Nonpaired Spin Spatial Molecular Orbital |
| DF-OCE | Dirac-Fock One-center Expansion |
| CDD | Charge-density Distortion |
| REPE | Resonance Energy Per Pi Electron |