Hi,

I'd like to report 2 bugs that I have when dealing with Feff calculations.  One is critical (program crashes), the other is more troublesome, but i've found ways around it.

OS: Windows 7, SP1

Demeter version: 0.9.18

1) Critical - Trying to add single scattering paths of arbitrary lengths. This used to work with an older version of the program, but now, no matter what I do, when I add a single scattering path with any length, the program crashes

I've attached the log file (dartemis.log)

How to replicate:

-import any file (i've attached Cu.inp for ease of comparison)

-run atoms

-run feff

-load an athena file (i've attached Cu foil.apj)

-go to "Path like" tab

-input any bond distance, and drag path over to the path list

-program should crash

This problem occurs both with cif files and inp files (and several of both file types have been tried), and (so far) any type of data set I try to import into athena. I've just chosen the attached files for their simplicity.

2) Not critical - I deal with a lot of organometallic compounds whose cif files correspond of only 1 absorbing atom surrounded by a network of non-absorbing atoms. i.e. not a regular, repeating lattice.  When I import the cif file for one of these compounds (see attachment, schrock 1.cif), the Atoms page is fine, but in the Feff page, the "potentials" lists the absorbing atom as ipot 0 and 1:

 POTENTIALS

  * ipot   Z      tag

     0     74     W         

     1     74     W         

     2     8      O         

     3     7      N         

     4     6      C         

     5     1      H  

while in the atoms list, it only appears once as ipot 0.  Naturally, if I just click "run Feff", the program returns an error.

My workaround to this has been to copy the atoms list into notepad, save, import into excel, subtract 1 from the ipot column (besides ipot 0), and replace the old atoms list with the corrected atoms list.  then I manually change the potentials to:

 POTENTIALS

  * ipot   Z      tag

     0     74     W         

     1     8      O         

     2     7      N         

     3     6      C         

     4     1      H         

after this it works fine.

So this isn't a big burden, after a bit of practice I've gotten pretty fast at editing the Feff file, but if there's some easier solution it would be great.

This problem occurs with any monomeric compounds.  If I run the feff on a dimeric organometallic compound, there's no problems.

Please let me know if there's any additional information I can supply that would help with this.

thanks,

Georges Siddiqi