Abstract
After a brief introduction to Zeeman spectroscopy of fusion plasmas, this diagnostic method is illustrated by a 'simple' spectrum obtained from the tokamak edge plasma. Thereafter, the more complex case of the Balmer lines is considered, as well as their interpretation in terms of those atomic and molecular processes which are relevant both for the production of these spectra and the line shapes. The corresponding case of the Balmer lines emitted by gas discharge plasmas is briefly considered, and we conclude by mentioning collisional processes requiring a fuller treatment in order to improve our understanding of these spectra.
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