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X-ray fluorescence - Moseleys Law |
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X-ray emission spectroscopy
from 1913!! Sharp peak spectrum, the wavelengths of
the peaks are target element dependant - known as the "characteristic
X-ray spectrum" of an element. First studied by Moseley in 1913 in
Manchester (he worked for Rutherford) using X-ray diffraction from crystals. The most intense short-wavelength
line (called Kα) was
found, as a function of element, to have a frequency dependant on the Z of
the element:
X-ray absorption is also
element specific: absorption edges -
sudden changes in absorption co-efficient at particular, element specific
wavelengths Both arise from electron inner shell transitions in atoms. |
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© Peter Hammond 2004 |