Manne Siegbahn was a prominent Swedish physicist known for his work in the field of spectroscopy and experimental physics. Born on December 3, 1886, he made significant contributions to the understanding of X-ray spectroscopy and radiation. Siegbahn was awarded the Nobel Prize in Physics in 1924 for his research on the diffraction of X-rays and the development of new spectroscopic techniques.
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Physics.[ref]
https://sok.riksarkivet.se/sbl/Presentation.aspx?id=5900. Independent professional profile
Portrait of Manne Siegbahn
. Nobel Foundation, 1924 portrait; individual photographer unspecified. Commons records Swedish-photograph public-domain status and United States public domain through publication before 1931. Source usage terms, via Wikimedia Commons. Source.