Raman spectroscopy of carbon monoxide adsorbed on silver island films
作者： I Mrozek , C Pettenkofer , A Otto
DOI: 10.1016/0039-6028(90)90077-L
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摘要: Abstract CO was adsorbed at 17 K on clean silver island films prepared in UHV. The surface enhanced Raman scattering (SERS) spectrum shows besides the stretch band ∼ 2112 cm−1 of “chemisorbed” an unshifted 2139 whose intensity saturates monolayer coverage. It is assigned to “ physisorbed” CO. signal condensed multilayer below detection threshold. With respect integrated thick films, broad 2 × 105 fold enhanced, narrow “physisorbed” about 1 104 fold, exceeding chemically unspecific classical enhancement for 3 103. We propose that “chemisorption” sites atomic scale roughness also induce SERS by species physisorbed near these via photoinduced charge transfer (so-called proximity effect).
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