malawi_glenn said:okay so you want to start phd position, or are you about to finish it?
Those formulas and some graphs can be found in textbooks called like "Radiation physics", a good book is:
"Radiative Processes in Astrophysics, by George B. Rybicki & Alan P. Lightman,
John Wiley and Sons, 1979."
Do you have a suporvisor/ study advisor or similar in your school that can help you?
A resource for cross sections is a tool used by scientists to analyze and measure the dimensions and properties of different materials or objects. It provides a visual representation of the internal structure or composition of the material.
Scientists use cross sections to study the microstructure of materials, such as rocks, metals, and biological samples. This allows them to understand the physical and chemical properties of the material, which can then be used to make predictions and draw conclusions about its behavior.
The most common methods for creating cross sections include using microscopes, electron microscopes, and other imaging techniques. These methods allow scientists to view the internal structure of the material at a very small scale, and some can even provide three-dimensional images.
Cross sections provide scientists with a better understanding of the structure and composition of materials, which can help in the development of new technologies and materials. They also allow for more accurate measurements and predictions, which can lead to more efficient and effective experiments and studies.
While cross sections can provide valuable information, they also have limitations. They are limited by the size and accessibility of the material being studied, as well as the capabilities of the imaging techniques being used. Additionally, cross sections may only provide a snapshot of the material at a specific point in time and may not show changes or reactions that occur over time.