Abstract
Coherent forward scattering atomic spectrometry (CFS) consists of the rotation of linearly polarized light as it passes through an atomic vapor located within a transverse or a longitudinal magnetic field, the Voigt effect or the Faraday effect, respectively. A fuel-rich air acetylene flame was used as the atom reservoir in this study. A Glan-Foucault calcite prism polarizer, placed prior to the flame, was oriented at a 45° angle to the magnetic field. A second polarizer, the analyzer, is placed after the flame to detect the amount of light which is rotated. When the analyzer is oriented orthogonally to the first polarizer, the signal produced is proportional to the square of the concentration of the analyte. The CFS signal can be linearized with respect to concentration by offsetting the analyzer by a small offset angle. A comparison of the noise characteristics for the squared and the linear systems was made in this study. The results of the study provide valuable information in the design, evaluation and optimization of a CFS spectrometer.
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