Affiliation:
1. Department of Chemistry, University of Illinois at Chicago (M/C 111), 845 West Taylor Street, Chicago, Illinois 60607-7061
Abstract
A novel polarization modulator design based on a rotating quarter-wave plate and preliminary results of its application for vibrational circular dichroism (VCD) are presented. The device permits quarter-wave retardation in the infrared with alternating senses so that the resultant components of circular polarization can be modulated at frequencies on the order of 100 Hz. We have been able to apply this device to measure VCD with a step-scan FT-IR spectrometer by incorporating a stressed ZnSe optical element as the rotating quarter-wave plate. VCD of α-pinene and camphor were obtained. While these test spectra were of low signal-to-noise ratio (S/N), they exhibited the correct VCD spectral features for these chiral molecules. While not yet of competitive, practical utility, this design is potentially adaptable to extension into the far-IR with alternative optical elements, permits variable-frequency polarization modulation, and should be capable of improved S/N with modifications to increase rotation frequency.
Subject
Spectroscopy,Instrumentation
Reference21 articles.
1. Keiderling T. A., in Practical Fourier Transform Infrared Spectroscopy, Ferraro J. R. and Krishnan K., Eds. (Academic Press, San Diego, 1990), p. 203.
2. Polavarapu P. L., in Fourier Transform Infrared Spectroscopy, Ferraro J. R. and Basile L. J., Eds. (Academic Press, New York, 1985), Vol. 6, p. 61
3. Nafie L. A. and Vidrine D. W., in Fourier Transform Infrared Spectroscopy, Ferraro J. R. and Basile L. J., Eds. (Academic Press, New York, 1982), Vol. 3, p. 83
4. Keiderling T. A., Appl. Spectrosc. Rev. 17, 189 (1981)
5. Nafie L. A., Adv. Infrared Raman Spectrosc. 11, 49 (1984)
Cited by
21 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献