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(a) Extinction spectrum (continuous line) of D61 nanospheres in water at T = 22 °C. Photoacoustic excitation profile (diamonds) of the same sample. Every single point of the latter profile is rescaled to the extinction spectrum by comparing the photoacoustic signal amplitude for D61 and potassium permanganate, as in the inset of Fig. 1a, at each wavelength. (b) Extinction (σE), absorption (σA), and scattering (σS) cross sections calculated from Mie theory.
