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Raman spectrum (a) of the first bead from the left, show in electron micrograph (b). (c) Five μm diameter polystyrene beads, transmission light micrograph observed trough the objective lens; inset (d) corresponding Raman image (1 pixel=1 μm) using the 1004 cm−1 band of polystyrene. Scale bar in (b) represents 10 μm, and in (c) and (d) 5 μm.
