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xuwei0909

至尊木虫 (著名写手)

[交流] DFIX加氢后的B和C错误怎么解决?

利用这两个指令加氢后产生如下B和C错误该如何解决?
DFIX 0.85 0.01 O1 H1W1 O1 H1W2 O2 H2W1 O2 H2W2 O3 H3W1 O3 H3W2 O4 H4W1 O4 H4W2
DFIX 1.35 0.02 H1W1 H1W2 H2W1 H2W2 H3W1 H3W2 H4W1 H4W2

Alert level B
PLAT731_ALERT_1_B Bond    Calc     0.85(5), Rep   0.850(10) ......       5.00 su-Ra     O3   -H3W1    1.555   1.555                                      
PLAT731_ALERT_1_B Bond    Calc     0.84(5), Rep   0.844(10) ......       5.00 su-Ra     O4   -H4W1    1.555   1.555      

Alert level C                              
PLAT731_ALERT_1_C Bond    Calc     0.85(3), Rep   0.845(10) ......       3.00 su-Ra      O4   -H4W2    1.555   1.555                                      
PLAT732_ALERT_1_C Angle   Calc     106(10), Rep      106(3) ......       3.33 su-Ra      H1W1 -O1   -H1W2    1.555   1.555   1.555
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xi2004

至尊木虫 (职业作家)

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xuwei0909(金币+10,VIP+0):谢谢!!!
最后不用DFIX, 改成AFIX 3 怎样?
或者 DFIX 0.85 0.02
试试
xi2004-emuch@163.com
2楼2008-10-19 18:35:28
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xuwei0909

至尊木虫 (著名写手)

二楼的方法好象不好用.各位,有好的解决方法吗?
3楼2008-10-20 20:10:14
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xi2004

至尊木虫 (职业作家)

解释在这里.

PLAT731 Type_1
Test for consistency of Bond su's and Coordinate su's in CIF A large ratio of the reported and calculated bond s.u.'s is found. The use of a DFIX instruction might cause such a warning since calculated s.u.'s are based on reported variances only.
Note_1: su's on the unitcell dimensions are taken into account in the calculation of expected su's. This may result in large differences between expected and reported su's when this contribution is not included in the reported su's, in particular for inaccurate unitcells.

Note_2: Another source for the discrepancy between calculated and reported su's can be that the validation software has access only to the variances of the refined parameters as opposed to the full co-variance matrix used by e.g. SHELXL for the calculation of derived parameters with associated su's. Constrained/restrained refinement may cause largei co-variances.

你说的可能是 DFIX 0.85 0.02  不行吧?  或许可以再调调 0.02 这个数值
去掉 DFIX 改成 AFIX 3  试过吗?
还有你的单胞偏差对吗?
xi2004-emuch@163.com
4楼2008-10-20 21:28:58
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