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4 Conclusion

We have calculated Stark widths and shifts for six infrared lines of helium arising from highly excited levels. We have used the Sahal-Bréchot theory and code which is well adapted to these calculations. We have provided data in the impact and in the quasistatic quadratic approximation. These data can be used for modellisation of early-type stars.

Acknowledgements

This work has been supported by the Cooperation Program "Elargissement des raies spectrales dans un plasma. Application Astrophysique'' between the French "Direction des Relations Internationales du CNRS'' and the Tunisian DGRST (Direction Générale de la Recherche Scientifique Tunisienne).


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