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Electron-impact excitation of Ti X.

The absolute intensities of Ti X spectral lines emitted from a theta-pinch plasma are measured with a 2.2-m grazing-incidence monochromator which is calibrated in situ by using the branching-ratio technique. An electron temperature of 50 eV and an electron density of 2.2 x 10/sup 16/ cm/sup -3/ of the plasma are determined from the laser scattering. The measured ratios of line intensities are compared with predictions based on the corona model using the excitation rates calculated by a distorted-wave method. It is shown that such a comparison is possible even for line intensities affected by self-absorption provided their optical depth corrections cancel in the ratio. The experimental uncertainty in the measured ratios is estimated to be +- 30%. The results show good agreement between experiment and predictions.