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yuanzilee23

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[½»Á÷] GSASÇó½Ì

ÓÃGSAS×ö¾§Ìå structure refinement ÊÇÐèÒªÊäÈëÒ»¸ö
POWDER instrument parameter file
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xi2004

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yuanzilee23(½ð±Ò+10,VIP+0):лл
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yuanzilee23(½ð±Ò+5,VIP+0):
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xi2004-emuch@163.com
2Â¥2008-09-26 16:08:34
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yuanzilee23

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3Â¥2008-09-26 16:15:34
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xi2004

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ÄãÄÜ¿´µ½\exampleÂð? ¿ÉÒÔµ½µ×ÏÂÈ¥¿´¿´Óм¸¸öPRM. ÎÒÖ»Óùýinst_prm

http://www.ccp14.ac.uk/solution/gsas/pprofile.htm

http://www.ccp14.ac.uk/solution/gsas/lebail/index.html
xi2004-emuch@163.com
4Â¥2008-09-26 16:49:00
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yuanzilee23

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ÔÚ\example ÏÂÃæÎÒ¿ÉÒÔ¿´µ½9¸ö.prm¸ñʽµÄÎļþ
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5Â¥2008-09-26 18:45:00
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xi2004

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yuanzilee23(½ð±Ò+5,VIP+0):·Ç³£¸Ðл
¸ù¾Ý¾ÍÊÇÄãµÄÑÜÉäÒǵÄÀàÐÍ.
±ÈÈç°Ð²Ä, ¼¸ºÎ¹¹ÐÍ ( Bragg-Brentano powder diffractometer)
¸ü¶àÐÅÏ¢¿É²Î¿¼GSASÊÖ²á, ccp14, »¹ÓÐgoogle.

±ÈÈç:


Re: Instument parameter file
Brian H. Toby
Thu, 18 Mar 2004 08:11:26 -0800

[EMAIL PROTECTED] wrote:
> Please remove me from the mailing list-thank you

I seem to provoke the above response every time I post to the list...

Anyway, to the Inst parm subject, I suggest to GSAS users that they
print out the e-mail message from Bob and staple it to the back of their
well-worn GSAS manual. There is another way to do this in EXPGUI. There
is a fairly new option (instedit on the Powder menu; also "edit file" on
the "add new histogram" window) that can be used to create or modify
instrument parameter files. The final result is the same: a [set of]
customized .prm file[s] suited for your instrument setup.

Brian


"Von Dreele, Robert B." wrote:
> In gsas\examples there is an iparm file (inst_xry.prm) that can be used for most any
> Bragg-Brentano powder diffractometer. These instruments all perform more or less
> equally independent of manufacturer with respect to the things of interest for
> Rietveld refinement. If after doing a calibration with some sharp standard material
> you think you ought to change some of the default parameters the following records
> in the iparm file might be changed.
>
> INS  1 IRAD     3
>
> This record determines the choice of standard wavelength for selecting f' and f" for
> each atom type to be used in structure factor calculations. IRAD=3 is for CuKa
> radiation.
>
> INS  1 ICONS  1.540500  1.544300       0.0         0       0.7    0       0.5
>
> This record contains the Ka1 and Ka2 wavelengths, zero point, polarization & Ka2/Ka1
> ratio. If just using CuKa you may only need to change the polarization coefficient
> (0.7 in this example). It can be refined for a standard with reasonably known atom
> thermal motion parameters and a wide 2-theta scan. Align your diffractometer so
> ZERO=0; any peak offsets you may see are due to sample displacement not zero offset.
>
> INS  1PRCF1     2    6      0.01
> INS  1PRCF11   2.000000E+00  -2.000000E+00   5.000000E+00   0.100000E+01
> INS  1PRCF12   0.100000E+01   0.000000E+00
>
> These records select the default profile function and values. The GU, GV and GW
> values are typical for most Bragg-Brentano diffractometers. Your sample will
> probably broaden the lines (LX, LY, etc.) so much that any attempt to vary the
> Gaussian coefficients will yield nonsense.
> Look in the GSAS Manual for details of the formats of these records and do the
> examples before you start on your own stuff.
> Bob Von Dreele
xi2004-emuch@163.com
6Â¥2008-09-26 21:18:24
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yusi335

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Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
ÒýÓûØÌû:
Originally posted by yuanzilee23 at 2008-9-26 18:45:
ÔÚ\example ÏÂÃæÎÒ¿ÉÒÔ¿´µ½9¸ö.prm¸ñʽµÄÎļþ
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7Â¥2009-07-21 20:34:29
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xi2004

ÖÁ×ðľ³æ (Ö°Òµ×÷¼Ò)

ÒýÓûØÌû:
Originally posted by yusi335 at 2009-7-21 20:34:


ÄãºÃ£¬ÊÇÔÚEXPGUIÀïÓÐexampleÂ𣿣¿

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xi2004-emuch@163.com
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