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Proceedings Paper

Surface Raman spectroscopy as a probe of surface chemistry
Author(s): Craig M. Child; Michelle Foster; J. E. Ivanecky III; Scott S. Perry; Alan Campion
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Paper Abstract

Unenhanced surface Raman spectroscopy has been used to study the chemistry of polymers adsorbed on solid surfaces and the chemical enhancement mechanism of surface-enhanced Raman scattering. The adsorption and reactions of the polyimide monomers pyromellitic dianhydride (PMDA) and oxydianiline on silver, copper and silicon surfaces under ultrahigh vacuum have been investigated. These include both nondissociative physisorption and dissociative chemisorption of the monomers, and the condensation polymerization to form adsorbed polyimide. The intermediate polyamic acid is detected for the first time in a surface experiment. PMDA adsorbed on Cu(111) shows chemical enhancement in the absence of electromagnetic enhancement. High resolution electron energy loss spectroscopy has revealed a strong charge transfer absorption near the Raman excitation frequency. This observation provides strong support for a proposed resonance Raman chemical enhancement mechanism.

Paper Details

Date Published: 25 September 1995
PDF: 10 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221481
Show Author Affiliations
Craig M. Child, Univ. of Texas/Austin (United States)
Michelle Foster, Univ. of Texas/Austin (United States)
J. E. Ivanecky III, Univ. of Texas/Austin (United States)
Scott S. Perry, Univ. of Texas/Austin (United States)
Alan Campion, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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