[Wien] about EELS

[Meng, Qingping]

Hi Kevin,
Thank you so much for your answer. I need the data after broadening calculation. I will plot figure myself. I do not know the name of output file after broadening. Could you tell me the file name. Thank you.
Best wishes,
Qingping

From: wien-bounces at zeus.theochem.tuwien.ac.at [mailto:wien-bounces at zeus.theochem.tuwien.ac.at] On Behalf Of Kevin Jorissen
Sent: Monday, December 08, 2014 9:44 AM
To: A Mailing list for WIEN2k users
Subject: Re: [Wien] about EELS

Hi Qingping,

the unbroadened eels is in the case.elnes file.  The broadening is done in a separate step, by the program "broadening".  You can call it by typing "x broadening".  It uses the file "case.inb".  This file has an ugly input format, but the parameters are explained in the manual.  The file is written automatically by the TELNES program.  You can change the parameters, e.g. the spectrometer broadening (Gaussian).  You can also change the lifetime (final state) broadening. Sometimes it is too aggressive and then it can be better to just turn it off.
If you are using w2web, then there should be a button for broadening in the TELNES workflow page.

The corehole lifetime broadening is taken from a table.  The spectrometer broadening is taken from input (case.innes).  The final state lifetime broadening is a guess.  But you should not hesitate to change the parameters so that you best match your experiment.  (After all, the true physics is to have energy-dependent broadening determined by the electron self-energy, and what we do in WIEN2k is only an approximation.)

Please let me know if you need further help.

Cheers,

Kevin


On Sun, Dec 7, 2014 at 6:29 PM, Meng, Qingping <qmeng at bnl.gov<mailto:qmeng at bnl.gov>> wrote:
Dear Kevin,
Thank you so much for your answer. Now I have another question. When I finished TELNES calculation, I need the data of broadening. Where can I find it? I only can find unbroadening data in case.elnes. Thank you.
Best,
Qingping

From: wien-bounces at zeus.theochem.tuwien.ac.at<mailto:wien-bounces at zeus.theochem.tuwien.ac.at> [mailto:wien-bounces at zeus.theochem.tuwien.ac.at<mailto:wien-bounces at zeus.theochem.tuwien.ac.at>] On Behalf Of Kevin Jorissen
Sent: Friday, December 05, 2014 6:17 AM
To: A Mailing list for WIEN2k users
Subject: Re: [Wien] about EELS

Hi Qingping,

looks like you have it mostly figured out already:

1/ These are all the same.
2/ That's correct.  You'll find an estimate of the onset energy itself in case.outputelnes (or in case.outputc), but you often have to shift them a bit to align with the experiment anyway.  Chemical shifts however are typically much more accurate than the absolute values of edge onsets.
3/ That's right.

Cheers,

Kevin


On Fri, Dec 5, 2014 at 4:49 AM, Meng, Qingping <qmeng at bnl.gov<mailto:qmeng at bnl.gov>> wrote:
Dear wien2k's users,
I have some questions about calculated EELS.
1) why the title of x-coordinate in some EElS figures use Energy-loss, and sometimes use Energy above Fermi, or Energy above threshold? Are they different?
2) 0 point of x-coordinate is the value of edge onset?
3) if I want to calculate L2 L3 peak, I need input n=2, l=1 in input file.
Thank you.
Best wishes,
Qingping

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