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marcin
marcin
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I'm afraid $\alpha$ has no physical meaning here.

The line profile (i.e. the shapeprofile of the diffraction peak) is a convolution of the instrument and physical broadening. The latter means broadening caused by the microstructure of the sample, which is typically divided into the size and strain components. (keyword: size-strain analysis)

But all the components above can contribute to both Gaussian and Lorentzian parts, so it's not like in spectroscopy that you can assign physical meaning to each part. Here Pseudo-Voigt (or Voigt or Pearson VII) is just an empirical shape.

I'm afraid $\alpha$ has no physical meaning here.

The line profile (i.e. the shape of the diffraction peak) is a convolution of the instrument and physical broadening. The latter means broadening caused by the microstructure of the sample, which is typically divided into the size and strain components. (keyword: size-strain analysis)

But all the components above can contribute to both Gaussian and Lorentzian parts, so it's not like in spectroscopy that you can assign physical meaning to each part. Here Pseudo-Voigt (or Voigt or Pearson VII) is just an empirical shape.

I'm afraid $\alpha$ has no physical meaning here.

The line profile (i.e. the profile of the diffraction peak) is a convolution of the instrument and physical broadening. The latter means broadening caused by the microstructure of the sample, which is typically divided into the size and strain components. (keyword: size-strain analysis)

But all the components above can contribute to both Gaussian and Lorentzian parts, so it's not like in spectroscopy that you can assign physical meaning to each part. Here Pseudo-Voigt (or Voigt or Pearson VII) is just an empirical shape.

Source Link
marcin
marcin
  • 215
  • 1
  • 6

I'm afraid $\alpha$ has no physical meaning here.

The line profile (i.e. the shape of the diffraction peak) is a convolution of the instrument and physical broadening. The latter means broadening caused by the microstructure of the sample, which is typically divided into the size and strain components. (keyword: size-strain analysis)

But all the components above can contribute to both Gaussian and Lorentzian parts, so it's not like in spectroscopy that you can assign physical meaning to each part. Here Pseudo-Voigt (or Voigt or Pearson VII) is just an empirical shape.