[Ifeffit] Artemis: How to treat Neglected? DS path

[Takahide Yamaguchi]

Dear all,

I have been analyzing some EXAFS data based on crystal structure by Artemis.

The model construction and analysis within the First shell had come
along OK.
And I would like to refine the analysis of higher shell including
multiple scattering.

But the problem about "How to treat the MS path(especially DS)" is
existing in the way to goal.

Generally, Considering triangle arrangement (A-B-C; A is Absorber, B is
nearest neighbor, C is the next neighbor)
offers the possibility of two double scattering paths.
Stated another way, the following two type can be readily considerable.

"Type I: A-->B-->C-->A and Type II; A-->C-->B-->A"

By calculation of FEFF on Artemis, a number of DS is computed and
listed, of course on my computer.
However, I could find JUST ONLY type II double scatter, no type I.

In this case, should I simply multiply the amplitude by two?

Or, are there reasonable answer to neglected type I path?

I will be glad with your help.

Best regards,
Takahide