Changes in Protonation State of Atmospherically Relevant α-Hydroxyacids at the Air-Water Interface Measured by Surface Tension and IR-RAS.

For example, in the bulk ATR spectra of HOA, at pH 10.9 the intensity of the ν COO– band is clearly significantly larger than the intensity of the ν COOH band at pH 2.7, due to the larger absorption cross-section of the ν COO– band.

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