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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 11 — Nov. 26, 2007

Near-Infrared Excited Raman Optical Activity

Laurence A. Nafie, Bruce E. Brinson, Xiaolin Cao, David A. Rice, Omar M. Rahim, Rina K. Dukor, and Naomi J. Halas

Applied Spectroscopy, Vol. 61, Issue 10, pp. 1103-1106 (2007)

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Measurements of near-infrared scattered circular polarization Raman optical activity (SCP-ROA) are presented using laser excitation at 780 nm for samples of S-(−)-α-pinene and L-alanyl-L-alanine. These are the first measurements of ROA outside the blue-to-green visible region between 488 and 532 nm. Comparison of Raman and ROA intensities measured with excitation at 532 and 780 nm demonstrate that the expected frequency to the fourth-power dependence for Raman scattering and the corresponding fifth-power dependence for ROA are observed. It can be concluded that, to within this frequency dependence, the same level of efficiency of Raman and ROA measurements using commercial instrumentation with 532 nm excitation is maintained with the change to near-infrared excitation at 780 nm.

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Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

Laurence A. Nafie, Bruce E. Brinson, Xiaolin Cao, David A. Rice, Omar M. Rahim, Rina K. Dukor, and Naomi J. Halas, "Near-Infrared Excited Raman Optical Activity," Appl. Spectrosc. 61, 1103-1106 (2007)

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