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[交流] 【请教】结构解析时都有哪些判断原子是否定错的方法

结构解析时都有哪些判断原子是否定错的方法
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lyl163com(金币+5): 2011-03-31 17:10:44
主要是看温度因子
2楼2011-03-31 12:44:35
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lyl163com

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引用回帖:
Originally posted by cluster8676 at 2011-03-31 12:44:35:
主要是看温度因子

那看温度因子,有没有判断的依据呢!或者是不是有表可查!比如O原子的温度因子一般是多少之类的!
3楼2011-03-31 13:32:05
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lyl163com(金币+2): 2011-03-31 17:10:57
U值,键长键角是否合理,
4楼2011-03-31 14:57:11
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xujun16

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lyl163com(金币+3): 2011-03-31 19:45:12
结构解析时都有哪些判断原子是否定错的方法?
Re: in general, isotropic displacement parameters, eg. B factor or U factor. (Uiso=Biso/78.96). (anisotropic atomic displacement parameters also work.)
  
    For inorganic ionic crystals and intermetallic compounds the typical range of B's is ~0.5 to ~1.0A; for other inorganic and many coordination compounds B varies from ~1 to ~3A, while for organic and organometallic compounds and for solvent or other intercalated non-bonded molecules or atoms this range extends from ~3 to ~10A or higher. If you isotropic displacement parameters in this range are reasonable.

        Hence, if the B becomes unphysical during the LS refinement, this usually means that the improper type of an atom has been placed in the suspicious site. There are two possibilities:

       (1) if the chemical element placed in a certain pisition has fewer electrons than is should, then during the refinement its diaplacement parameters becomes negative or much lower than those of the correctly placed atoms;

       (2) When the site has too many electrons than it really does, displacement parameters of the corresponding atom will be unusually high during the refinement.

Maybe helpful!
Reference: Fundamentals of Powder diffraction and Structural Characterization of Materials Vitalij K. Pecharsky 2003
5楼2011-03-31 19:20:49
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小木虫(金币+0.5):给个红包,谢谢回帖交流
yanhualover(金币+1): 谢谢交流 2011-04-01 13:05:35
我不知道书上是怎么写的,我师兄教我结晶体的时候告诉我,温度因子在0.05左右比较正常。如果温度因子超过0.15,或者很小比如0.0002, 就说明原子可能定错了
6楼2011-03-31 21:00:27
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小木虫(金币+0.5):给个红包,谢谢回帖交流
但是如果原子序数太接近了,就需要其他的手段来证明了,比如质谱
7楼2011-04-02 01:13:43
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