| Acronym | Meaning |
| PEFC | Polymer Electrolyte Fuel Cell |
| QRF | Quadratic Response Function (a Quantum Propagator) |
| TEY | Total Electron Yield |
| CPA | Coupled-pair Approximation |
| VEH | Valence Effective Hamiltonian Method (for Electronic Structure) |
| SDSR-CI | Single And Double Excitations From Single Ref. State Function-CI Method |
| SEAM | Scanning Electron Acoustic Microscopy |
| NTGS | Air/Superfund National Technical Guidance Study |
| IBICC | Ion Beam Induced Charge Collection |
| TXRF | Total Reflection X-ray Fluorescence |