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| RMCProfile: NEUTRON_COEFFICIENTS |
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Posted by: HankunXu - 11-22-2023, 07:10 AM - Forum: RMCProfile
- Replies (1)
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Hi, all,
"NEUTRON_COEFFICIENTS" is explicitly used as a subordinate keyword for "NEUTRON_REAL_SPACE_DATA" and "NEUTRON_RECIPROCAL_SPACE_DATA",
So, what about "XRAY_RECIPROCAL_SPACE_DATA",
(1) The subordinate keywords under the main keyword are directly entered as "NEUTRON_COEFFICIENTS";
Code: XRAY_RECIPROCAL_SPACE_DATA ::
> FILENAME :: 1.dat
> DATA_TYPE :: F(Q)
> FIT_TYPE :: F(Q)
> FITTED_SCALE
> NEUTRON_COEFFICIENTS:: 0.01510 0.00547 0.19228 0.00049 0.03480 0.61196
> CONVOLVE ::
> RECIPROCAL_SPACE_FIT :: 1 1110 1
> RECIPROCAL_SPACE_PARAMETERS :: 1 1110 0.003
> REAL_SPACE_FIT :: 100 1600 1
> REAL_SPACE_PARAMETERS :: 100 1600 2000
(2) or do we need to change the major keyword as "NEUTRON_RECIPROCAL_SPACE_DATA", i.e., nominally for the neutron, but actually for xray ?
Code: NEUTRON_REAL_SPACE_DATA :: 1
> FILENAME ::1.dat
> DATA_TYPE :: D(r)
> FIT_TYPE :: D(r)
> START_POINT :: 100
> END_POINT :: 1600
> CONSTANT_OFFSET :: 0.0000
> WEIGHT :: 0.015
> NEUTRON_COEFFICIENTS:: 0.01510 0.00547 0.19228 0.00049 0.03480 0.61196
> NO_FITTED_OFFSET
> FITTED_SCALE
"NEUTRON_COEFFICIENTS" would be the best choice if we want to distinguish the same element at different sites.
Thanks
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| anomalous X-ray scattering |
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Posted by: yasu - 07-20-2023, 11:31 AM - Forum: RMCProfile
- Replies (1)
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Hi all.
I would like to fit anomalous X-ray scattering (AXS) and neutron data for a crystalline sample with partial occupancies. Are there any plans to add the function to analyze AXS data? Or do you have any alternative idea to do it?
(I know that RMC++ can analyze AXS data but is not good at analyzing Bragg peaks.)
Thank you.
Yasu
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Data reduction speed |
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Posted by: y8z - 05-13-2023, 08:59 PM - Forum: Data Reduction
- No Replies
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Here in the following link, I put the test result of the running time for current data reduction routine used for powder diffraction data reduction,
https://powder.ornl.gov/run_time.html
It will be very nice if you can take a look at your instrument and give feedback in current thread.
You can just log in with your UCAMS to post.
To vote, put down your instrument name followed by your vote, like this ('+1' means it looks good, '-1' means you are expected shorter running time and so you need to give your expected running time),
N.B. I know that the actual running time really depends on the samples and data involved in the reduction. In the link above, I put down all the files I have been using for getting the running time result, so we can use them as the reference for the discussion and voting.
HB2A: +1
HB2A: -1, [My expected running time]
HB2C: +1
HB2C: -1, [My expected running time]
NOMAD: +1
NOMAD: -1, [My expected running time]
POWGEN: +1
POWGEN: -1, [My expected running time]
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| Tools available for experimental planning |
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Posted by: y8z - 02-27-2023, 10:13 PM - Forum: Pre-Experiment Tools
- No Replies
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Experimental Planning Tools
Scattering in the cloud (temporary, but strongly recommended),
https://addie.ornl.gov
This web based tool contains the following capabilities, - Structure mining: By providing a composition and a measured PDF, the engine can mine the database for best suitable structure
- PDF or Bragg pattern simulation
- PDF or Bragg pattern refinement
- Total scattering help sheet
Useful links about neutron characteristics
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