Instrument for natural and magnetic Raman optical activity studies in right-angle scattering

✍ Scribed by Lutz Hecht; Laurence D. Barron

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 906 KB
• Volume: 25
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.1250250703

✦ Synopsis

Abstract

A simple computer‐controlled instrument for natural and magnetic incident circular polarization Raman optical activity (ICP ROA) measurements in right‐angle scattering is described. The key spectral elements consist of a fast single‐stage monochromator equipped with a holographic notch filter, a highly efficient holographic diffraction grating and a thinned back‐illuminated, thermoelectrically cooled charge‐coupled device (CCD) detector. A temperature‐stabilized longitudinal electro‐optic modulator is employed to switch between orthogonal circular polarization states in the incident laser radiation. A polaroid film together with a mica half‐wave retardation plate are used to select particular linear polarization states in the Raman scattered radiation with the same instrumental response. High‐quality depolarized and polarized Stokes and depolarized anti‐Stokes ICP ROA spectra of (R)‐(−) and (S)‐(+)‐phenyloxirane and depolarized magnetic resonance ICP ROA spectra of copper(II) tetrabromide are presented as typical examples of the excellent performane characteristics.