| Acronym | Meaning |
| STOM | Scanning Tunneling Optical Microscopy |
| ETS | Electron Transmission Spectroscopy |
| ITS | Inelastic Tunnelling Spectroscopy |
| RXF | Refracted X-ray Fluorescence |
| PVAL | Polyvinyl Alcohol |
| NLMO | Natural Localized Mol. Orbital |
| HARM | Hazardous Atmospheric Release Model |
| TARP | Technical Assistance Response Program |
| STA | Single-transition Approximation |
| NHFPT | Nonorthogonal Hartree-Fock Perturbation Theory |