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The infrared absorption from molecular monolayers is enhanced a factor of 20 by thin metal overlayers or underlayers with use of the attenuated-total-reflection technique. The total enhancement, including contributions from the attenuated-total-reflection geometry, is almost 10^4. This effect is consistent with an electric field enhancement due to collective electron resonances associated with the island nature of the thin metal films.
Hartstein et al. (Mon,) studied this question.
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