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Noble metallic nanostructures exhibit a phenomenon known as surface - enhanced Raman scattering ( SERS ) in which the Raman scattering cross sections are dramatically enhanced for the molecules adsorbed thereon .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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