| Acronym | Meaning |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| PTS | Position-tagged Spectroscopy |
| ATM | Airborne Thematic Mapper |
| IASCC | Irradiation-assisted Stress-corrosion Cracking |
| SEMPA | Scanning Electron Microscopy With Polarization Analysis |
| VO | Virtual Orbital |
| MP2-R12 | MP2 Theory With Terms Linear In Interelectronic Distance (r12) |
| PEXAFS | Photoemission Extended X-ray Absorption Fine Structure |
| AVCC | Average Carbonaceous Chondrites |
| LCBO | Linear Combination Of Bloch Orbital |