| Acronym | Meaning |
 | PDPA | Phase Doppler Particle Analyzer |
| PSS | Perturbed Stationary State |
| XSAD | X-ray Small Angle Diffraction |
| AQCP | Air Quality Control Program |
| MCSX | Multiconfiguration Single Excitation |
| NTSB | National Transportation Safety Board |
| ALICE | Acid-labile Isotope-coded Extractants |
| MSFC | Marshall Space Flight Center |
| FDCD | Fluorescence Detected Circular Dichroism |
| CHIRP | Core-hole Initiated Relaxation Process (in Ionic Crystals) |
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