| Acronym | Meaning |
| RCSF | Reference Configuration-state Function |
| ARC | Accelerating Rate Calorimetry |
| RASSI | Restricted Active Space State Interaction |
| ZDC | Zero-degree Calorimeter |
| RMS | Root Mean Square |
| RIS | Rotational Isomeric State |
| RER | Rough Endoplasmic Reticulum |
| UFM | Ultrasonic Force Microscopy |
| NQCC | Nuclear Quadrupole Coupling Constants |
| MIEMS | Membrane Inlet Electrochemical Mass Spectrometry |