An Analytical Expression for Fractional Absorption in MÖssbauer Spectroscopy
2009
Removing the restriction that the line widths ( Gamma s and Gamma a ) of a source and an absorber be equal, we have obtained an exact analytical expression for the fractional intensity of absorbed gamma -rays in MOumlssbauer spectroscopy. This expression is compact and consists of three terms; the first two are known in the literature for the case Gamma s =Gamma a , and the third term contains a simple sum of higher-order terms arising from Gamma s ne Gamma a . We provide quantitative analyses and a discussion of the contribution from this third term and its effect on the fractional absorption of a MOumlssbauer spectral line.
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