Abstract
A system for securing the laser-Raman spectrum of a thin layer on a reflecting metal surface is discussed. The general design considerations are specifically illustrated for a thin layer on silver using a 4880 Å laser exciting line. For this case the optimum angle of incidence for laser illumination is calculated to be 70° and the optimum angle for collection of the Hainan-scattered light is around 60° from the surface normal. The sensitivity of the method is illustrated by showing two lines from the Raman spectrum of a 50 Å-layer of benzoic acid on a silver film.
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