Abstract
A new approach to analyze the nuclear gamma resonance (NGR) spectra is presented and justified in the paper. The algorithm successively spots the Lorentz lines in the experimental spectrum by a certain optimization procedures. In Mossbauer spectroscopy, the primary analysis is based on the representation of the transmission integral of an experimental spectrum by the sum of Lorentzians. In the general case, a number of lines and values of parameters in Lorentzians are unknown. The problem is to find them. In practice, before the experimental data processing, one elaborates a model of the Mossbauer spectrum. Such a model is usually based on some additional information. Taking into account physical restrictions, one forms the shape of the lines which are close to the normalized experimental Mossbauer spectrum. This is done by choosing the remaining free parameters of the model. However, this approach does not guarantee a proper model. A reasonable way to construct a structural NGR spectrum decomposition should be based on its model-free analysis. Some model-free methods of the NGR spectra analysis have been implemented in a number of known algorithms. Each of these methods is useful but has a limited range of application. In fact, the previously known algorithms did not react to hardly noticeable primary features of the experimental spectrum, but identify the dominant components only. In the proposed approach, the difference between the experimental spectrum and the known already determined part of the spectral structure defines the next Lorentzian. This method is effective for isolation of fine details of the spectrum, although it requires a well-elaborated algorithmic procedure presented in this paper.
Highlights
In Mossbauer spectroscopy, the primary analysis of the nuclear gamma resonance (NGR) spectrum structure is based on the representation of the transmission integral of an experimental spectrum f (x) by the following sum of Lorentzians: n f (x) = s=1 1 +
Where xs is the position of the maximum of the sth Lorentz line on the velocity scale, and 2bs is its width
The Mossbauer spectrum is always measured in some bounded velocity range
Summary
In Mossbauer spectroscopy, the primary analysis of the NGR spectrum structure is based on the representation of the transmission integral of an experimental spectrum f (x) by the following sum of Lorentzians:. Some model-free methods of the NGR spectra analysis have been implemented in algorithms for the density distribution of hyperfine fields, for the density distribution of isomer shifts with lines in the Lorentz or Gauss forms [2], and for filtering and reducing noises [3]. Each of these methods is useful but has a limited range of application. This method is effective for isolation of fine details of the spectrum, it requires (see [4]) a well-elaborated algorithmic procedure presented in this paper
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