Definition of Test Case 1

Computer Science – Databases

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Test case no 1, as defined during the meeting of the radiation working group in Marseilles, 19-20/9/02, is intended for validation of spectroscopic databases. Therefore, the most simple validation case should be retained. This corresponds to the modelling of a plasma in chemical and thermodynamical equilibrium. Inductively coupled plasma torches allow obtaining a steady-state plasma in these conditions. Consequently, spectral measurements ranging from UV to near-IR obtained in such a torch were selected for validation purposes. These spectra have been measured in an experimental facility located at the Stanford High Temperature Gasdynamics Laboratory [1]. 1.2 Characteristics of the measured spectra The emitting plasma is considered to be in thermochemical equilibrium. Measurements were obtained using line-of-sight emission spectroscopy. The slit function can be approximated by a trapezoid of base 3.42 ˚A and top 1.7 ˚A, which corresponds to real widths of the entrance and exit slits of 80 µm and 240 µm respectively (the reciprocal linear dispersion of the monochromator being 10.7 ˚A/mm at 6328 ˚A).

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