[Wien] TELNES calculation procedure

yunxx133 University of Minnesota yunxx133 at umn.edu
Mon Nov 9 01:34:11 CET 2020


Dear Wien2k users,

I have a question regarding the procedure to calculate EELS core-loss edges
(TELNES3).
In the Wien2k manual, the procedure described is:
run_lapw
x lapw1
x qtl -telnes
x telnes3

However, I've found that some users add 'x lapw2 -qtl' like the procedure
for XSPEC.
run_lapw
x lapw1
x lapw2 -qtl
x qtl -telnes
x telnes3

I observed that without the 'lapw2 -qtl', in the simulation, the onset of
an edge is always at 0 eV not taking into account a proper/real onset of a
spectrum.
For example, let's say an edge presumably starting at 535 eV is simulated.
If I enter the onset energy of 530 eV in .innes, the resulting .elnes file
should have a spectrum starting from 5 eV (onset at 5 eV = 535 eV).
However, the result shows the onset at 0 eV regardless of the onset energy
set in .innew.
On the other hand, if I include lapw2 -qtl, the onset energy in the
resulting data shifts as expected, i.e. starting at 5 eV.

Thus, I came to the conclusion that the simulation including 'x lapw2 -qtl'
can correctly simulate the edges as opposed to the manual.
Could anyone confirm whether this sounds right? or could anyone point out
what I am missing here?
For your information, the version that I used for this was wien2k 14.2.

Thank you for reading and I will wait to hear any insight from experts!

Best,
H. Yun
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