Stimulated Raman laser excitation of spontaneous resonance Raman scattering

Duyne, Richard P. Van; Parks, K. D.

doi:10.1016/0009-2614(80)87002-3

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…This becomes very important when the molecule is large and placed in a strongly inhomogeneous field. This was recently verified experimentally by van Duyne et al , who inserted different numbers of non-active linker molecules between the adsorption site of a molecule and the Raman active site [79]. In this experiment, the Raman signal was highly dependent on the number of linker molecules, and therefore on the distance between the surface and the Raman active site, particularly for non-regular (tetrahedral) nanoparticles.…”

Section: Field Enhancement and Serssupporting

confidence: 64%

Plasmon Resonances in Nanowires with a Non—regular Cross-Section

Martin

Topics in Applied Physics

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Abstract. We investigate numerically the spectrum of plasmon resonances for metallic nanowires with a non-regular cross-section in the 20-50 nm range. After briefly recalling the physical properties of metals at optical frequencies, we point out the intrinsic difficulties in the computation of the plasmon resonances for nanoparticles with a non-regular shape. We then consider the resonance spectra corresponding to nanowires whose cross-sections form different simplexes. The number of resonances strongly increases when the section symmetry decreases: A cylindrical wire exhibits one resonance, whereas we observe more than 5 distinct resonances for a triangular particle. The spectral range covered by these different resonances becomes very large, giving to the particle specific distinct colors. At the resonance, dramatic field enhancement is observed at the vicinity of non-regular particles, where the field amplitude can reach several hundred times that of the illumination field. This near-field enhancement corresponds to surface enhanced Raman scattering (SERS) enhancement locally in excess of 10 12 . The distance dependence of this enhancement is investigated and we show that it depends on the plasmon resonance excited in the particle, i.e. on the illumination wavelength. The average Raman enhancement for molecules distributed on the entire particle surface is also computed and discussed in the context of experiments in which large numbers of molecules are used. Finally we discuss the influence of the model permittivity which enters the calculation, as well as the resonances shift and broadening produced by a water background.

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Section: Field Enhancement and Serssupporting

confidence: 64%

Plasmon Resonances in Nanowires with a Non—regular Cross-Section

Martin

Topics in Applied Physics

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“…For Raman studies the applied potential was set beyond the E 0/ value of the electrochemical process, and data were collected after sufficient time that the probed volume contained only the reduced or oxidised product. The frequency‐doubled output from an Nd:YAG (Continuum Surelite I‐10) pulsed laser (5−7 ns pulse width, operating at 10 Hz) was used to generate excited‐state resonance Raman (ESRR) spectra at 532 nm, it was also used to provide stimulated Raman scattering64,65 for the ESRR experiments with 633 nm excitation. The 532 nm output from the Nd:YAG laser was focused into a 10‐cm cell filled with spectrophotometric grade acetonitrile.…”

Section: Methodsmentioning

confidence: 99%

Probing the Nature of the Redox Products and Lowest Excited State of [(bpy)2Ru(μ-bptz)Ru(bpy)2]4+: A Resonance Raman Study

Gordon

Burrell

Simpson

et al. 2002

Eur. J. Inorg. Chem.

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Keywords: Raman spectroscopy / Mixed-valent compounds / Ab initio calculations / Ruthenium(II) / TetrazinesThe resonance Raman and infrared spectra of the bridging ligand 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine (bptz) have been studied. Ab initio calculations on bptz and the radical anion bptz ·− are able to predict the frequencies and intensities of the vibrational spectra. This analysis is used to interpret the vibrational spectroscopy of the bridged binuclear complexes [(bpy) 2 Ru(µ-bptz)Ru(bpy) 2 ] 4+ (1) and [(PPh 3 ) 2 Cu(µ-bptz)-Cu(PPh 3 ) 2 ] 2+ (2) and their redox products. The resonance Raman spectroscopy of 1 reveals the bichromophoric nature of the complex, with bpy and bptz ligand modes being enhanced selectively as a function of excitation wavelength. The UV/Vis spectrum of 1 + reveals a strong IVCT band sug-

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“…The frequency-tripled output from a Nd:YAG (Continuum Surelite I) pulsed laser (5-7 ns pulse width, operating at 10 Hz) was used to generate stimulated Raman scattering 13 for the excited state resonance Raman (ESRR) experiments. The 355 nm output from the Nd:YAG laser was focused into a 10 cm cell filled with spectrophotometric grade acetonitrile.…”

Section: Physical Measurements and Calculationsmentioning

confidence: 99%