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. 2022 Apr 29;5:58. doi: 10.1038/s42004-022-00674-8

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Fig. 3 — a Polarized VSFS spectra for aerosol particles from 4 M propionic acid in a 0.5 M NaCl seed solution with HHH, HHV, HVH, and VVH (H horizontal polarization, V vertical polarization). b Schematic of orientational configuration of the –CH₃ group of propanoic acids at the aerosol surface.