[Wien] txspec

[Jorissen Kevin]

	Joo :In 'txsepc.f' the l -> l+1 transition is calculated first and stored into 'X(I,1)'. Then the l -> l-1 transition is calculated and stored into 'X(I,2)'. These two transitions have nothing to do with the L2- or L3-edge. As I told you, both edges contain these two transitions. The sum of X(I,1) and X(I,2) is stored into new variable X(I) and another new variable is introduced, XINTER(I). XINTER(I)=0 untill I=JEMIN+ISPLIT-1 and XINTER(I)=X(I) for I=JEMIN+ISPLIT to I=JEMAX+ISPLIT. Later XOUT(I)=XINT1*X(I)+XINT2*XINTER(I) is performed for I=JEMIN,JEMAX+ISPLIT. FInally, energy, XOUT(I), X(I,1) and X(I,2) are printed out. So, I think the SPLIT can 'split' the 2p_1/2 -> d (l+1) transition and 2p_1/2 -> s (l-1) transition, not the L2- and L3-edges.
	

	Kevin : I'm not familiar with the xspec-code, but I do know telnes, which was based on it, and resembles it quite closely.  I think you are completely mistaken.  Split DOES split L2 and L3, and X(.,1) and X(.,2) do contain L3 and L2 - not l+1 and l-1 components of the spectrum.  That's the case for telnes, anyway.

	 

	
	Joo :Another question. How come the L2- and L3-edge spectra are identical to each other? Experimentally, they ARE different from each other. Theoretically, they should be different. Maybe the radial wave functions are not much different from each other, however, there are quite large difference in the occupation of states with different angular momentum (l) and its z-comp (m) quantum number. Therefore, it should make, at least, some difference in the dipole transition matrix elements.

	Kevin : I have investigated this in the telnes-routine.  Yes, there are differences, and you can calculate them for telnes.  Xspec calculates the shape only once and assumes the second edge to have the same shape as the first one.  But of course it takes a statistic branching ratio into account, i.e., an L3-edge will have twice the intensity of the corresponding L2-edge.  This may or may not be close to the experimental ratio.  The differences in shape (unaccounted for in xspec) are small in telnes, as far as I've seen.

	
	Kevin.
	

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