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Metals have the ability to shield external electric field, therefore when laser light used for excitation in Raman spectroscopy falls on the metal surface, it cannot penetrate very deeply.

Also, noble metals have crystal structures with only one atom per unit cell, therefore only acoustic phonons exist, and no optic phonons that could be detected with Raman. Exceptioon is gallium - see ref.

J.A. Creighton and R. Withnall

Chemical Physics Letters , volume 326 (2000) pages 311-313.

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