| AUG | Auger electron spectroscopy |
| CAD | Collisionally-activated dissociation |
| CEMS | Charge exchange mass spectrometry |
| CI | Chemi-ionization |
| CIEL | Charge inversion energy loss spectroscopy |
| CTS | Charge transfer spectra |
| DER | Derivation |
| DTI | Delayed thermionic ionization |
| EI | Electron impact techniques ("Electron impact") |
| END | Determinations of endothermicity of reaction |
| EQ | Ion/molecule equilibrium constant determination |
| EST | Estimation |
| EVAL | Evaluation |
| IMB | Ion/molecule bracketing |
| LE | Liquid phase electrochemical determination |
| LS | Laser spectroscopy (includes multiphoton ionization and resonance ionization mass spectrometry (RIMS)) |
| PE | Photoelectron spectroscopy |
| PI | Photoionization mass spectrometry |
| PIPECO | Photoion-photoelectron coincidence spectroscopy |
| S | Optical spectroscopy |
| SI | Surface ionization |
| TE | Threshold electron detection |
| TRPI | Time-resolve photodissociation |