FWHM

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Revision as of 18:04, 19 March 2023 by Mark (talk | contribs) (Created page with "Full Width Half Maximum Is calculated assuming a Gaussian peak shape. In our implementation we use the Ag (silver) k-alpha lines. However, most systems report resolution referenced to Mn (manganese). There are two k-alpha lines which typically can not be resolved with current detectors. The Ag lines are at 22.162 keV and 21.988 keV. To calculate the true FWHM we must first deconvolve the two lines from the resulting spectra. Next using the measured FWHM for the...")
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Full Width Half Maximum

Is calculated assuming a Gaussian peak shape. In our implementation we use the Ag (silver) k-alpha lines. However, most systems report resolution referenced to Mn (manganese). There are two k-alpha lines which typically can not be resolved with current detectors. The Ag lines are at 22.162 keV and 21.988 keV. To calculate the true FWHM we must first deconvolve the two lines from the resulting spectra. Next using the measured FWHM for the Ag k-alpha-1 using the formula below we calculate the system noise. Next we take the system noise, change to our energy to Mn (5.898 keV) and solve the same equation for FWHM. Note the energy is always specified as eV, not keV.

File:Fwhm1.jpg
File:Fwhm2.jpg

Note: The 2.35 constant is the multiplier for 3-sigma of a Gaussian. Fano factor is 0.12 and epsilon is 3.86 eV.

See also: Wikipedia FWHM

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