Unified treatment of fluorescence and Raman scattering processes near metal surf

2020-02-14 22:54:41

electromagnetic Raman scattering fluorescence Franck

责任者: Hongxing Xu;Xue-Hua Wang;Persson, M.P.;Xu, H.Q.;Kall, M.;Johansson, P. 单位: Div. of Solid State Phys., Lund Univ., Sweden 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2004/12/10,93(24):243002-1 摘要: We present a general model study of surface-enhanced resonant Raman scattering and fluorescence focusing on the interplay between electromagnetic effects and the molecular dynamics. Our model molecule is placed close to two Ag nanoparticles and has two electronic levels. A Franck-Condon mechanism provides electron-vibration coupling. Using realistic parameter values for the molecule we find that an electromagnetic enhancement by 10 orders of magnitude can yield Raman cross sections σR of the order 10-14 cm2. We also discuss the dependence of σR on incident laser intensity 关键词: electron-phonon interactions;fluorescence;Franck-Condon factors;nanoparticles;silver;surface enhanced Raman scattering;fluorescence;Raman scattering processes;metal surfaces;surface-enhanced resonant Raman scattering;electromagnetic effects;molecular dynamics;model molecule;Ag nanoparticles;Franck-Condon mechanism;electron-vibration coupling;electromagnetic enhancement;incident laser intensity;Ag