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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
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Related Experiment Video

Updated: Jun 17, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Published on: November 21, 2019

An automatic recording magnetooptical rotation spectropolarimeter.

J G Forsythe1, R Kieselbach, V E Shashoua

  • 1Engineering Physics Laboratory, E. I.du Pont de Nemours and Co., Wilmington, Delaware 19898, USA.

Applied Optics
|January 9, 2010
PubMed
Summary

This study details an automatic spectropolarimeter designed to precisely measure the Faraday effect. The instrument enables direct measurement of solute rotation across a wide spectral range using opposing magnetic fields.

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Area of Science:

  • Spectroscopy
  • Magneto-optics
  • Analytical Chemistry

Background:

  • The Faraday effect, a key magneto-optical phenomenon, is crucial for understanding material properties in magnetic fields.
  • Accurate measurement of magneto-optical rotations requires sophisticated instrumentation capable of high precision across various wavelengths.
  • Existing methods may lack the directness or precision needed for detailed spectral analysis of solute rotation.

Purpose of the Study:

  • To design and construct an automatic recording spectropolarimeter for precise measurement of magneto-optical rotations (Faraday effect).
  • To enable direct measurement of solute rotation as a function of wavelength in a magnetic field.
  • To achieve high precision measurements in both the ultraviolet and visible spectral regions.

Main Methods:

  • Development of an automatic recording spectropolarimeter.
  • Incorporation of two opposed 5000 G magnetic fields, one for solution and one for solvent.
  • Wavelength scanning from 250-750 nm to record spectral data.

Main Results:

  • The instrument provides direct measurement of solute rotation, eliminating solvent contributions.
  • Achieved precision of +/-0.001 degrees in the visible spectrum and +/-0.003 degrees in the UV spectrum.
  • Demonstrated instrument performance with typical spectral data.

Conclusions:

  • The developed spectropolarimeter offers a precise and direct method for analyzing the Faraday effect.
  • The instrument's capabilities facilitate detailed spectral characterization of magneto-optical properties.
  • This tool advances the study of solute rotation and material behavior under magnetic influence.