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别开枪是我

木虫 (正式写手)

[交流] 弱弱的问一个cif的A类错误的解决方法

Alert level A
PLAT232_ALERT_2_A Hirshfeld Test Diff (M-X)  Br1    --  Cu1


PLAT232 Type_2 Hirshfeld Rigid-Bond Test (Metal-X) (Acta Cryst (1976),A32,239-244
--------------------------------------------------------------------------------

The components of the anisotropic displacement parameters along chemical
bonds are assumed to be equal in magnitude. Large differences supposedly
indicate contamination of these parameters with other (unresolved) effects
such as (substitutional) disorder, model or data errors and/or
over-refinement. Atomic sites assigned the wrong scattering type (e.g. Ag
versus Br) should generate 'problem signals' with this test. Data sets
corrected for absorption effects with DELREF techniques (e.g. DIFABS, SHELXA,
XABS2) often show large DELU values for bonds involving the heaviest atom.
Note: The original 'Hirshfeld-test' was defined in absolute terms (see
F.L.Hirshfeld, Acta Cryst. (1976). A32, 239-244). The current test is with
reference to the associated standard uncertainty.

请问这些是什么意思   怎么解决????谢谢大家帮忙
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级数收敛


lingzi326(金币+1):欢迎讨论
原子种类指认错误或者无序
如果确定是对的,那么
DELU   0.01   Br1   Cu1
引用回帖:
Originally posted by 别开枪是我 at 2008-12-5 21:06:
Alert level A
PLAT232_ALERT_2_A Hirshfeld Test Diff (M-X)  Br1    --  Cu1


PLAT232 Type_2 Hirshfeld Rigid-Bond Test (Metal-X) (Acta Cryst (1976),A32,239-244
--------------------------------- ...

[ Last edited by 级数收敛 on 2008-12-5 at 21:42 ]
2楼2008-12-05 21:40:48
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xi2004

至尊木虫 (职业作家)


lingzi326(金币+1):欢迎讨论
DELU   0.01   Br1   Cu1
通常还不够,
要DELU 0.001 Br1   Cu1
当然, 要确认Br1 Cu1指认没有问题.
xi2004-emuch@163.com
3楼2008-12-05 23:10:38
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