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Understanding the interfacial properties of aerosol particles is importantfor science and medicine, crucial for air quality, human health, andenvironmental chemistry. Qian et al. presented vibrational sum frequencyscattering (SFS) measurements of organic molecules on aerosol particles.$^{1}$Relating an aerosol sample with a 40 nm average size and 10 - 300 nm particlesize distribution at a density of 10$^{6}$ particle/mL to vibrational sumfrequency scattering spectra recorded in a different apparatus, it wasconcluded that the vibrational spectra reported on the surface structure of theparticles in the aerosol. Here, we show that the SF scattering power of suchsmall particles with a density of 10$^{6}$ particle/mL is $\sim$ 10$^{7}$smaller than the detection limit of the presented SFS experiment. We determinethe detectable number density of particles, both theoretically andexperimentally, to demonstrate the limits of the SFS method. We also proposepossible reasons for the 10$^{7}$ order of magnitude discrepancy.

Can vibrational sum frequency scattering spectra be measured from the surface of 40-100 nm aerosols in a cloud containing 10$^{6}$ particles/mL?