= Charles Barkla
{c}
{tag=Physicist}
{title2=1877–1944}
{wiki}
= Charles Glover Barkla
{c}
{synonym}
= C. G. Barkla
{c}
{synonym}
<Charles Barkla> distinguished characteristic <X-ray> <emission> associated with a <chemical element> from <radiation> that varied more continuously with the exciting conditions. Comparisons of secondary <radiation>, <absorption> and <emission> showed that different <chemical elements> produce reproducible characteristic components. The emitting material therefore became an experimentally identifiable part of the <spectrum>. This work helped establish <X-ray spectroscopy> as a probe of atomic structure before a complete microscopic explanation of the characteristic lines was available.<The Spectra of the Fluorescent Röntgen Radiations by Charles Glover Barkla>[Characteristic secondary-radiation measurements]{ref}<Nobel Lectures, Physics 1901–1921/Characteristic Röntgen Radiation by Charles Glover Barkla>[Nobel lecture: characteristic emission and atomic structure]{ref}
A <physicist>.https://mathshistory.st-andrews.ac.uk/Biographies/Barkla/[Independent professional biography and identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Charles%20Glover%20Barkla%2001.jpg?width=250]
{title=Portrait of <Charles Barkla>}
{description=George Grantham Bain Collection, Library of Congress, ggbain.39225; individual photographer not identified. https://commons.wikimedia.org/wiki/File:Charles_Glover_Barkla_01.jpg#Licensing[Commons PD-US claim; Library of Congress no-known-publication-restrictions statement. Other jurisdictions may differ.], via Wikimedia Commons.}
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{width=250}
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