Can we get the R-matrix procedure to calculate the free-free transition freely?

In summary, the conversation discusses the need to calculate free-free transitions using the close-coupling method and mentions that M.J. Seaton has developed a procedure (STGFF) for this purpose. However, the procedure is not freely available online. The possibility of using an R-matrix procedure is also mentioned, with a recommendation to refer to the book "Theory of Atomic and Molecular Collisions" for more information.
  • #1
mrxpisgood
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I want to calculate the free-free transitions using the close-coupling method, and it is said that M. J. seaton etc. have already developed a good procedure (module STGFF) to calculate the free-free transition(Free-free transitions and spectral-line broadening, M. J. seaton 2000,Journal of Physics B: Atomic, Molecular and Optical Physics), the mothod is almost completed, but I haven't found that procedure on the internet. Is it a freely procedure? or Is there any R-matrix procedure to calculate the free-free transition? I have a procedure which can calculate the bound-free transitions. and I don't wish to do repeated work on procedure modification.
Thanks a lot.
 
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  • #2
Unfortunately, the STGFF procedure developed by M.J. Seaton is not available for free online. You could contact M.J. Seaton directly to inquire about this procedure. Alternatively, you could look into using an R-matrix procedure to calculate free-free transitions. There are several R-matrix codes available that can be used to model electron-atom and electron-ion collisions. The theoretical framework of the R-matrix method is described in detail in the book "Theory of Atomic and Molecular Collisions" by A.D. McLean and A.K. Das.
 

Related to Can we get the R-matrix procedure to calculate the free-free transition freely?

1. What is the R-matrix procedure?

The R-matrix procedure is a computational method used to calculate the interaction between electrons and ions in a plasma. It is based on the R-matrix theory, which describes the scattering of particles in terms of their wave functions.

2. How does the R-matrix procedure calculate free-free transitions?

The R-matrix procedure calculates free-free transitions by first dividing the space around an ion into an inner region and an outer region. The wave functions of the electrons in the inner region are then solved using quantum mechanical equations, while the outer region is treated using classical physics. The two regions are then combined to determine the probability of free-free transitions.

3. What is the advantage of using the R-matrix procedure for calculating free-free transitions?

The R-matrix procedure is advantageous because it can account for both quantum mechanical and classical effects, making it more accurate than other methods. It also allows for the inclusion of many different types of interactions, such as electron-electron and electron-ion interactions, making it a versatile tool for studying plasmas.

4. Are there any limitations to using the R-matrix procedure for free-free transition calculations?

One limitation of the R-matrix procedure is that it can only be applied to systems with a small number of particles. This means that it is not suitable for studying large-scale plasmas, such as those found in astrophysical environments. Additionally, it is a computationally intensive method and can be time-consuming to run.

5. Can the R-matrix procedure be used to calculate other types of transitions?

Yes, the R-matrix procedure can also be used to calculate other types of transitions, such as bound-free and bound-bound transitions. It is a versatile method that can be applied to a wide range of plasma processes, making it a valuable tool for scientists studying plasmas in various contexts.

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