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yuanzilee23

至尊木虫 (著名写手)

[交流] GSAS求教

用GSAS做晶体 structure refinement 是需要输入一个
POWDER instrument parameter file
是一个.prm的文件
请问这个文件是什么文件,怎么弄出来的
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xi2004

至尊木虫 (职业作家)

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
yuanzilee23(金币+10,VIP+0):谢谢
lingzi326(金币+1,VIP+0):谢谢热心回复~~~
yuanzilee23(金币+5,VIP+0):
这个文件在\Gsas\EXAMPLE 底下, 比如普通的PXRD仪器就用inst_xry.prm
xi2004-emuch@163.com
2楼2008-09-26 16:08:34
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yuanzilee23

至尊木虫 (著名写手)

普通的XRD仪器指的是?
有什么特别的么,是不是所有所需的.prm文件都在example下面目录里面了
可否详细的说明下,谢谢~
3楼2008-09-26 16:15:34
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xi2004

至尊木虫 (职业作家)

你能看到\example吗? 可以到底下去看看有几个PRM. 我只用过inst_prm

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

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

至尊木虫 (著名写手)

在\example 下面我可以看到9个.prm格式的文件
你开始用inst_xry.prm 的时候是根据什么来用这个文件的呢?
有没有什么依据
5楼2008-09-26 18:45:00
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xi2004

至尊木虫 (职业作家)

★ ★ ★ ★ ★
yuanzilee23(金币+5,VIP+0):非常感谢
根据就是你的衍射仪的类型.
比如靶材, 几何构型 ( Bragg-Brentano powder diffractometer)
更多信息可参考GSAS手册, ccp14, 还有google.

比如:


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
6楼2008-09-26 21:18:24
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yusi335

木虫 (小有名气)


小木虫(金币+0.5):给个红包,谢谢回帖交流
引用回帖:
Originally posted by yuanzilee23 at 2008-9-26 18:45:
在\example 下面我可以看到9个.prm格式的文件
你开始用inst_xry.prm 的时候是根据什么来用这个文件的呢?
有没有什么依据

你好,是在EXPGUI里有example吗??
7楼2009-07-21 20:34:29
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xi2004

至尊木虫 (职业作家)

引用回帖:
Originally posted by yusi335 at 2009-7-21 20:34:


你好,是在EXPGUI里有example吗??

实在GSAS下有个文件夹.
xi2004-emuch@163.com
8楼2009-07-21 21:05:15
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