[GSAS-II] Trouble Shooting

[Arianna Lanza]

Hi Emily!

DISCLAIMER: I am a very new GSAS-II user.


1)      I noticed that phase markers appear only if you select the Histogram (PWDR tree item), or the Reflection Lists subtree item. Clicking on Background, Limits, Sample Parameters, Peak List, Index Peak List, Unit cells List subtree items as well as the “Phases” tree items shows the pattern but not the phase tick markers. At least in my computer.

2)      In order to manually define the background points to be fitted, select the background subtree item and the Fixed Points menu will appear in the menu bar. You can select, move or delete points with this menu, then click the fit background (same menu). As far as I understand it will fit those points using the function that is selected in the main Background tab, so you may have to choose the most suitable.

Good luck,

Arianna

From: Philipp Hans [mailto:philipp.hans at tuwien.ac.at]
Sent: martedì 16 gennaio 2018 15:42
To: Emily Siska <siskae at unlv.nevada.edu>
Cc: gsas-ii at aps.anl.gov
Subject: Re: [GSAS-II] Trouble Shooting

Hello!

To phase markers I cannot tell much. Usually they are there (maybe only after refinement of the phase?).

I also requested a feature concerning the background once. I cannot estimate if it is very complex to do so. One option available is to define anchor points that are used to calculate the bg-function. That can be tedious and doesn't solve the issue of the bad adaptation..
There is also a possibility to load a dataset from a file as background, if there is e.g. amorphous signal.

Best,
Phil

Emily Siska <siskae at unlv.nevada.edu<mailto:siskae at unlv.nevada.edu>> schrieb am Fr., 12. Jän. 2018, 03:58:
Hello,

I have two problems:

1. I cannot get the phase markers to show on the plot
2. Are you able to graphically refine the background? The program cannot fit the background well with any function of amount of coefficients.

Thank you!

Best Regards,
Emily Siska


--
Emily Siska

Chemistry Graduate Assistant
Chemistry/HiPSEC

Science and Engineering Building, Room 2173
University of Nevada, Las Vegas
4505 S. Maryland Pkwy.
Las Vegas, NV 89154-4003
Office: (702) 894-1478
Cell: (818) 642-7718
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