19200
Optical properties of localized plasmon resonances in such structures are studied by UV - vis - NIR spectroscopy and finite - difference time domain simulations during the transition from rings to crescents revealing the development of strong quadrupolar modes .
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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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