= Johannes Stark
{c}
{tag=Physicist}
{title2=1874–1957}
{wiki}
<Johannes Stark> measured the splitting of atomic <spectral lines> in a strong <electric field>. The <Stark effect> connects that applied field with changes in atomic <energy levels> and therefore the <frequencies> of emitted <light>. Resolving the splitting requires control of the <electric field>, the emitting region and the <spectral resolution>. Different observed components need not shift equally: the pattern tests how the electric perturbation changes the available <quantum states>, rather than merely showing that the light source is affected.<Observation of the Separation of Spectral Lines by an Electric Field by Johannes Stark>[1913 experimental communication]{ref}<Nobel Lectures, Physics 1901–1921/Structural and Spectral Changes of Chemical Atoms by Johannes Stark>[Nobel lecture: electric-field effects on spectra]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Johannes%20Stark.jpg?width=250]
{title=Portrait of <Johannes Stark>}
{description=A. B. Lagrelius & Westphal, Stockholm; Les Prix Nobel 1919 (1920), p. 121; Nobel Foundation source. https://commons.wikimedia.org/wiki/File:Johannes_Stark.jpg[Commons PD-Sweden photograph claim. File requests an additional United States public-domain tag; worldwide status is not asserted.], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Johannes_Stark.jpg}
{width=250}
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