This NASA webpage provides a description of three ways that the acceleration of free electrons can produce electromagnetic radiation. Each method is illustrated by a diagram. Numerous links define terms and provide further information.
NASA/Goddard Space Flight Center. X-rays from free electrons. Greenbelt: NASA/Goddard Space Flight Center, October 1, 2010. http://imagine.gsfc.nasa.gov/science/toolbox/xray_generation_el.html (accessed 25 September 2017).
%0 Electronic Source %D October 1, 2010 %T X-rays from free electrons %I NASA/Goddard Space Flight Center %V 2017 %N 25 September 2017 %8 October 1, 2010 %9 text/html %U http://imagine.gsfc.nasa.gov/science/toolbox/xray_generation_el.html
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