We use molecular beam scattering experiments to investigate the ways in which gas molecules are captured by and react with industrially important liquids and atmospheric aerosols.  These experiments enable us to explore the interfacial analogues of bulk solvation, hydrogen bonding, the “like dissolves like” rule, proton exchange, and acid-base reactions. Scattering experiments can disentangle the elementary steps in interfacial and bulk reactions involving a wide range of gases and liquids (including squalane, glycerol, sulfuric acid, sodium hydroxide, and liquid metals).  These pathways are illustrated in the figure for collisions of HCl with supercooled D2O/D2SO4.  This system is used to model reactions in sulfuric acid aerosols that destroy ozone in the stratosphere.

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