Manne Siegbahn developed precision X-ray spectroscopy for investigating atomic structure. A crystal converts an X-ray wavelength into a diffraction angle through Bragg's law. Careful control of the crystal geometry, angular calibration, spectral resolution and instrumental absorption therefore determines which characteristic spectral lines can be distinguished. His instrumentation resolved relationships and small differences that a coarser spectrometer would merge, making precision measurement part of the explanation of atomic X-ray spectral lines.[ref]
The X-ray Spectra and the Structure of the Atoms by Karl Manne Georg Siegbahn. Nobel lecture: precision X-ray spectroscopy and atomic interpretation
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. Articles by others on the same topic
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.