Fig. 3.
Schematic overview of the entire NAM-IR setup. 1. Sampling setup. Different aerosol generators were used for different experiments; the electrospray aerosol generator was supplied with both CO2 and filtered air, while the basic jet nebulizer used only filtered air. 2. Experimental setup used for photothermal recordings of NAM-IR spectra. IR light is focused onto the string using a parabolic mirror, and frequency measurements are carried out using a vibrometer and lock-in amplifier.