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In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Thomson scattering in the average-atom approximation.

W R Johnson¹, J Nilsen, K T Cheng

¹Department of Physics, 225 Nieuwland Science Hall University of Notre Dame, Notre Dame, Indiana 46556, USA. johnson@nd.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 4, 2012

Summary

This summary is machine-generated.

The average-atom model simplifies x-ray Thomson scattering diagnostics for warm dense matter, particularly considering bound electron scattering. This method aids analysis of plasmas like hydrogen, beryllium, aluminum, and titanium.

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Area of Science:

Plasma Physics
X-ray Scattering
Atomic Physics

Background:

Warm dense matter (WDM) presents unique challenges for diagnostic techniques.
Understanding electron behavior, especially bound electrons, is crucial for accurate WDM characterization.
X-ray Thomson scattering (XTS) is a powerful diagnostic for probing WDM properties.

Purpose of the Study:

To apply the average-atom model to XTS diagnostics in WDM.
To emphasize the role of scattering from bound electrons.
To develop a simplified diagnostic tool for XTS measurements.

Main Methods:

Utilizing the average-atom model to compute necessary parameters.
Calculating parameters such as chemical potential, average ionic charge, and electron densities.
Obtaining bound and continuum wave functions and occupation numbers.

Main Results:

The average-atom model provides essential parameters for dynamic structure function calculations.
A simplified diagnostic method for XTS measurements is proposed.
Applications to dense hydrogen, beryllium, aluminum, and titanium plasmas are presented.
Significant spectral modification due to bound states is predicted for titanium.

Conclusions:

The average-atom model offers a practical approach for analyzing XTS data from WDM.
Scattering by bound electrons plays a significant role and must be accounted for.
This work facilitates more accurate diagnostics of WDM properties.