[GSAS-II] use K-beta lines?

[William Boyer]

Hello GSAS-II users,

Apologies if this is well-known; I have looked for the answer.
Is there a way to use a source spectrum that includes K-beta?
Equivalently, how can I fit to diffraction data that includes all of Kα1, Kα2, and Kβ lines?

More generally, can I use a customized source spectrum that includes more lines than the traditional Kα1 and Kα2 lines?  I wish to apply some of the very accurate models of the Kα spectrum (that include not only Kα-1 and -2, but also -3, -4 etc.) to the source spectrum description used by GSAS-II?  And then extend this to using the analogous full description of the Kβ spectrum?

Motivation:  Not just for use when a β filter is not thick enough - I want to measure lattice parameter of some simple metals (BCC, FCC) as accurately as possible.  By using an Si SRM lightly sprinkled on top, I get something like an internal standard and still mostly non-overlapping peaks without a beta filter. The additional peaks enable greater accuracy (with the "internal" standard and modeling the source spectrum more completely and accurately) and precision (using more peaks).

Thank you very much,
William Boyer
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Materials Scientist, PhD
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