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雪花纷芬

金虫 (小有名气)

[求助] CIF文件错误处理

晶体解析完,CIF检查完出现如下错误,应该怎么处理?谢谢各位
Alert level B
PLAT230_ALERT_2_B Hirshfeld Test Diff for    C3     --  C6      ..        7.6 su   
PLAT230_ALERT_2_B Hirshfeld Test Diff for    C7     --  C8      ..        8.0 su
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forever1706

禁虫 (知名作家)

抛砖,等专家:

IUCR的解释:


The components of the anisotropic displacement parameters along chemical
bonds are assumed to be equal in magnitude. Large differences might
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.
2楼2013-11-20 05:43:33
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546672286

金虫 (著名写手)

【答案】应助回帖

感谢参与,应助指数 +1
Hirshfeld Test Diff for          C3     --  C6      ..        7.6 su     

解决方法:ins 文件里加入 delu 0.02   C3   C6
3楼2013-11-20 08:45:39
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冰刃001

木虫 (小有名气)

【答案】应助回帖

★ ★ ★ ★ ★
感谢参与,应助指数 +1
雪花纷芬: 金币+5, ★★★很有帮助 2013-11-20 11:57:12
3楼正解,但0.02不一定能解决,可用0.01 或者0.001试试。
4楼2013-11-20 09:47:17
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雪花纷芬

金虫 (小有名气)

引用回帖:
2楼: Originally posted by forever1706 at 2013-11-20 05:43:33
抛砖,等专家:

IUCR的解释:


The components of the anisotropic displacement parameters along chemical
bonds are assumed to be equal in magnitude. Large differences might
indicate contamin ...

非常感谢,但是读不懂
5楼2013-11-20 11:56:28
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forever1706

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引用回帖:
4楼: Originally posted by 冰刃001 at 2013-11-20 09:47:17
3楼正解,但0.02不一定能解决,可用0.01 或者0.001试试。

xue xi le ...

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6楼2013-11-20 19:28:39
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雪花纷芬

金虫 (小有名气)

送红花一朵
引用回帖:
6楼: Originally posted by forever1706 at 2013-11-20 19:28:39
xue xi le ......

OK ,thank you very much
7楼2013-11-21 10:37:12
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