I do exactly the same - fit tube tails using LaB6 standard and use the
parameters (usually w/o fitting) in all other refinements. Although tube tails
fitting helps a lot it's not perfect.
Peter Zavalij
-Original Message-
From: Alan Coelho [mailto:alancoe...@bigpond.com]
Sent: Sunday,
Dear All,
Really, I appreciate too much all your comments. I'm glad to be part of
this list.
My best wishes.
Mario.
I do exactly the same - fit tube tails using LaB6 standard and use the
parameters (usually w/o fitting) in all other refinements. Although tube
tails fitting helps a lot
Alan, Peter,
Would you mind briefly elaborating on the procedure used to fit tube
tails? I personally have only used GSAS for Rietveld refinement, and other
than adding another phase(s) with slightly different lattice parameter(s) I
am not sure I understand how you would account for the
Matt,
I forgot to mention that it was done using fundamental parameters in TOPAS
which has built-in tube tails function. I don't think GSAS has it. Alan
probably can tell you more how it is realized in TOPSAS.
Peter Zavalij
-Original Message-
From: Matt Beekman
Matt,
The one time I tried to model tube tails with widely available software was
in Fullprof and the approach was to include extra wavelengths in the
profile.
In case you would like to get a good understanding of the fundamental
parameters approach, see Cheary, Coelho and Cline's paper in the
Matt
I am not sure I understand how you would account for the additional
wavelengths in the beam.
Tube tails is spectrally independent and its aberration shape is 2Th
independent. Its realized in TOPAS by a convolution called stacked_hats
which, as its name suggests, convolutes a series of
Hi,
Wouldn't a change of Ni filter for a thicker one at least reduce
significantly the problem. It would absorb mostly below the edge but still
will absorb a significant amount of all the radiation that goes through
reducing the tails? Or a monochromator is the only solution? Would a tube
Tubetails are simply the result of emission of the target radiation from
outside the wanted line focus, some mm around. Depending on tube
quality, age and operating power, one can have varying shapes when
projected on the 2theta scale. Examples:
http://www.bgmn.de/tubetails.html
As you can
