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(A) EF calculated for the dimer of two spheres and the corresponding isolated single Ag NP (90 nm diameter). The color scale is logarithmic, and EFs outside the range 10°–108 are shown in dark blue and dark red, respectively. Adapted with permission from ref (50). Copyright 2000 The American Physical Society. (B) Long-tail probability distribution of EFs in SERS. Reproduced with permission from ref (431). Copyright 2009 American Chemical Society.
