Ellipsometric Raman Spectroscopy

By Fernando Costa Basílio, Patricia Targon Campana, Eralci Moreira Therézio, Newton Martins Barbosa Neto, Françoise Serein-Spirau, Raigna Augusta Silva, Osvaldo Novais Oliveira, Jr., Alexandre Marletta

July 28, 2017

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Title

Ellipsometric Raman Spectroscopy

Author

Fernando Costa Basílio, Patricia Targon Campana, Eralci Moreira Therézio, Newton Martins Barbosa Neto, Françoise Serein-Spirau, Raigna Augusta Silva, Osvaldo Novais Oliveira, Jr., Alexandre Marletta

Year

2016

Journal

Journal of Physical Chemistry C

Abstract

We introduce a new experimental technique referred to as Ellipsometric Raman Spectroscopy (ERS) to quantify the Raman Optical Activity (ROA) where ellipsometry is combined with Raman spectroscopy. The Stokes parameters were determined for Raman scattered light using Fourier decomposition in measurements with achromatic optical components in a 9-point method. We tested the methodology with ultrapure water, a well-known chiral alcohol and a chiral polymer, and show that ERS allows for studying not only the vicinities of chiral carbons but also molecular species coupled to form chiral structures. Furthermore, in ERS isotropic and anisotropic scattering contribute equally, thus making it possible to analyze the low-wavenumber region in samples such as the chiral polymer studied here, for which the ROA signal probably arises mainly from isotropic scattering.

Full Article

http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b08809

Instrument

J-810

Keywords

Circular dichroism, Polymers, Stereochemistry