BASIC STUDIES REGARDING LINE BROADENING.
Final rept. 1 Jun 66-31 May 68,
TEXAS UNIV AUSTIN PLASMA PHYSICS LAB
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The ratio of halfwidth to critical value for the transition between quasi-static and impact domain of electron contributions to linear Stark broadening according to Unsold is expected to vary approximately with n to the 4th power, where n is the upper principle quantum number of the line considered. Low density plasmas generated by a radio frequency arrangement permit the observation of many non-overlapping Balmer lines and thus a drastic variation of the ratio for identical plasma parameters access deep into the quasi-static as well as impact regime of electron broadening is realized to a degree not achieved previously. As recently suggested, the observed broadening can be approximated in terms of an effective quasi-static perturber density, which is a universal function of the displacement from the line center expressed in units of the above mentioned critical transition value. Author
- Plasma Physics and Magnetohydrodynamics