Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy.

Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Research Abstract Details 

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Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Abstract Text:

John R Lombardi,Ronald L Birke,

We reexamine the Herzberg-Teller theory of charge-transfer contributions to the theory of surface enhanced Raman scattering (SERS). In previous work, the Kramers-Heisenberg-Dirac framework was utilized to explain many of the observed features in SERS. However, recent experimental and theoretical developments suggest that we revise the theory to take advantage of the time-dependent picture of Raman scattering. Results are obtained for molecular adsorption on nanoparticles in both the strong confinement limit and the weak confinement limit. We show that the Herzberg-Teller contributions to the charge-transfer effect in SERS display a resonance at the molecule-to-metal or metal-to-molecule transition while retaining the selection rules associated with normal Raman spectroscopy (i.e., harmonic oscillator, as opposed to Franck-Condon overlaps). The charge-transfer contribution to the enhancement factor scales as Gamma(-4), where Gamma is the homogeneous linewidth of the charge-transfer transition, and thus is extremely sensitive to the magnitude of this parameter. We show that the Herzberg-Teller coupling term may be associated with the polaron-coupling constant of the surface phonon-electron interaction. A time-dependent expression for the Raman amplitude is developed, and we discuss the implications of these results for both metal and semiconductor nanoparticle surfaces.

Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Publishing Authors By Initials

JR Lombardi,RL Birke,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: The Journal of chemical physics

VOLUME: 126

Page Numbers: 244709

Journal Abbreviation:

ISSN: 0021-9606

DAY: 28

MONTH: Jun

YEAR: 2007

Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Information

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LANGUAGE: eng

NlmUniqueID: 375360

Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: methods

Chemical & Substance for Abstract: Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy. Information

Substance Name: Metals

Registry Number: 0

Grant and Affiliation Information for Time-dependent picture of the charge-transfer contributions to surface enhanced Raman spectroscopy.

AFFILIATION: Department of Chemistry, The City College of New York, New York, New York 10031, USA.

Country: United States

AGENCY: United States NIGMS

GRANT: GM08168

ACRONYM: GM

MEDLINETA: J Chem Phys

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