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Stark effect
The broadening or splitting of a spectral line that results when an electric field slightly changes the energy levels of a radiating atom or ion. Stark broadening is proportional to the ion and electron density in a plasma and is therefore a good indicator of pressure in a stellar atmosphere and hence of the star's luminosity. The effect is named after the German physicist Johannes Stark (1874-1957).
Related category
• SPECTRA AND SPECTROSCOPY
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