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Raman Spectroscopy with a Fiber-Optic Probe and Multichannel Detection

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Thomas J. Vickers , Jeanne Pecha and Charles K. Mann

Department of Chemistry, Florida State University, Tallahassee, FL 32306-4390

J. Chem. Educ., 2001, 78 (12), p 1674

DOI: 10.1021/ed078p1674

Publication Date (Web): December 1, 2001

Abstract

This laboratory exercise is suitable for an undergraduate course in instrumental methods of analysis. The first part of the exercise illustrates some principles of multichannel detection applied to optical spectroscopy. A neon atomic line spectrum is recorded and used to relate detector element (pixel) position to spectrum wavelength. The spectrum of a white-light source is recorded to examine how the system response varies with wavelength. In the second part of the exercise rapid, nondestructive analysis by Raman spectroscopy is demonstrated. The spectra of some known materials are recorded and used to identify the major component (or components) of an unknown white powder sample. The composition of a liquid sample is determined by least-squares fitting of spectra of pure components to the sample spectrum. The use of a fiber-optic probe provides a demonstration of the many benefits of an approach increasingly employed for online measurements.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Inexpensive Raman Spectrometer for Undergraduate and Graduate Experiments and Research
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- Inexpensive Raman Spectrometer for Undergraduate and Graduate Experiments and Research
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  Journal of Chemical Education2010 87 (3), 326-330
  We describe the construction and performance of an inexpensive modular Raman spectrometer that has been assembled in the framework of a fourth-year undergraduate project (costs below $5000). The spectrometer is based on a 4 mW 532 nm green laser pointer ...
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