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Supplemental InformationApplication of SERS on the Chemical Speciation of Individual Aitken Mode Particles After Condensational GrowthRyota Kunihisa1, Ayumi Iwata2, Masao Gen3,4, Chak K. Chan3, Atsushi Matsuki5,*1Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan2Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan3School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China4Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan5Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan Figure S1. Raman spectra acquired from laboratory generated 50 nm ammonium sulfate (AS) particles deposited on SERS substrate following condensational growth. The spectra were obtained using a 532?nm excitation laser and compared between 4 different laser power conditions. The typical photocarbonization background in the finger print region 1100-1700 cm-1 (Xu et al., 2012) can be found with stronger laser power conditions.Figure S2. Background Raman spectra acquired from original SERS substrate itself. Also shown are spectra acquired following drops of pure water (Milli-Q), reagent grade ethanol, and methanol on the substrate. Inset shows the closer view of the peak found at 965 cm-1. The exact cause of the small background peak at 965 cm-1 is not known, but appears only after deposition of the solvents. ................
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