Abstract
The L X-ray spectrum of thorium following 1 MeV proton impact has been measured using a Si(Li) detector. The spectrum was analysed by various commonly used procedures. It is shown that the separation of the L γ group into X-ray transitions of L 1 and L 2 subshells is affected by the natural lineshape model. The common practice of neglecting the natural lineshape (Lorentzian or other shapes where there are many-body effects) introduces systematic errors which are larger than the frequently-cited error bars. In the example used here, the effects of neglecting natural lineshape are similar in size to the difference in theoretical L 1/L 3 and L 2/L 3 subshell ionization cross section ratios predicted for protons by the ECPSSR and coupled channel calculations. Similar systematic errors will arise in other contexts. The optimum accuracy inherent in Si(Li) spectroscopy will only be realised if full account is taken of natural lineshapes in the treatment of the X-ray spectra.
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