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Unpolarized line of the MHGD ( , pressure 500 mbar, voltage 190 V, and current 8 mA). The line was recorded end-on from cathode side as indicated in (a). Line profile is given in (b) together with the best-fit model curve (solid line). The residue is presented in (c). Voigt and beam components of the best-fit model curve are depicted by dashed and dotted line, respectively. Argon lines were excluded from the fit, and corresponding residue was set to zero. Magnified view is given in (d).
Scaled line profiles recorded end-on through aperture and with reversed polarity, compared with Voigt profile from Fig. 1. Discharge conditions: as in Fig. 1.
Best-fit model parameters for the profile given in Fig. 1: Lorentz width ; Gaussian width ; mean energy , and energy-width of the ion beam; electric field at the cathode surface; CS thickness ; attenuation coefficient ; and part of photons emitted by isotropically scattered atoms. Discharge conditions as in Fig. 1.
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