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别开枪是我木虫 (正式写手)
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弱弱的问一个cif的A类错误的解决方法
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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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2楼2008-12-05 21:40:48
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3楼2008-12-05 23:10:38












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