title: Direct visual evidence for chemical mechanism of SERRS of the S-complex of pyrimidine molecule adsorbed on silver nanoparticle via charge transfer.
abstract: In this paper, the S-complex of pyrimidine molecule absorbed on silver clusters was employed as a model molecule to study the enhancement mechanism in surface-enhanced resonance Raman scattering (SERRS). We described the chemical enhancement of SERRS through charge transfer (CT) from Ag20 to pyrimidine on resonance excitation, and electromagnetic enhancement through intracluster charge redistribution (CR) on the electronic intracluster collective oscillation excitation. It is shown that SERRS process of the pyrimidine molecule absorbed on silver clusters with different incident wavelength are dominated by different enhancement mechanisms. Both experimental and theoretical works have been performed to understand the CT process in SERRS.
authors.affiliation: The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China. Electronic address: pjwang@cnu.edu.cn.
authors.forename: Peijie
authors.initials: P
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603-146, Beijing 100190, China.
authors.forename: Shaoxiang
authors.initials: S
authors.lastname: Sheng
authors.affiliation: The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.
authors.forename: Lisheng
authors.initials: L
authors.lastname: Zhang
authors.affiliation: The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Fang
mesh_terms: D000327:Adsorption; D004566:Electrodes; D004583:Electrons; D053768:Metal Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D011743:Pyrimidines / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
chemical_list: D011743:Pyrimidines; D012834:Silver; C030986:pyrimidine
keywords: Charge difference density; Charge transfer; Chemical enhancement; Intracluster charge redistribution; Surface-enhanced resonance Raman scattering