Size-selective cryogenic photoelectron spectroscopy (cryo-PES) coupled with electrospray ionization source (ESI) has been demonstrated to be a powerful experimental technique to characterize the physical and chemical properties of a wide variety of anionic clusters generated from charged droplets. Various novel molecular clusters ranged from small and medium sized solvated complex anions to atmospherically relevant pre-nucleation clusters have been studied by employing this technique. Distinctly different solvation motifs of kosmotropic versus chaotropic anions have been unraveled regarding organizing local solvent structures. In a series of HSO<sub>4</sub><sup>−</sup>(VOC) (VOC = volatile organic compounds) surrogate binary clusters, we have directly observed enormous difference of intermolecular interactions that allows us to track the specific molecular properties that are critical to biogenic aerosol formation by ranking highly hierarchic molecular interactions according to the different functional groups.

Spectroscopic characterization and computational investigation of anionic clusters generated from charged droplets

2019 Fall National Meeting

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