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A white light illuminated Mach-Zehnder interferometer and a spectrograph are used to obtain spectral side-on interferograms of a steady state free burning arc for different observation directions by rotating the arc between taking the records. The vertical plasma column contains chromium atoms being evaporated by plasma-wall interactions from an electrically insulated and cascaded cylindrical chromium oxide wall surrounding the discharge in the bottom electrode region. The phase change of light waves passing the plasma column is determined highly resolved in the spectral neighbourhood of resonance lines of neutral chromium atoms using FFT algorithms. The angularly dependent integral phase changes corresponding to different observation directions are subject to a computerized tomographic reconstruction procedure yielding the spatially resolved distribution of ground state chromium atoms in the observed cross section of the slightly asymmetric plasma column.
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Theo Neger (1995) studied this question.
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