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[交流]
【求助】請教一個CIF問題
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文章投到 inorganic chemistry, 審稿人提出:“Report the position and possible contacts of the largest electron density peak. This can be reported in _refine_special_details.” 請教各位蟲友,這個問題是什么意思呢?這個位置我填的是“_refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ;” 我看大家也都是這么寫的呢。 希望大家給點(diǎn)意見。 謝謝! |
» 搶金幣啦!回帖就可以得到:
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鐵桿木蟲 (職業(yè)作家)
至尊木蟲 (文壇精英)
| 我請教了專家,是關(guān)于殘余電子密度的問題。單晶結(jié)構(gòu)解完后,要求殘余最大(+值)和最小Q(負(fù)值)峰(electron density peak)小于1。如果大于以1,要根據(jù)其位置判斷是否是什么原子沒有確定。比如,你的結(jié)構(gòu)中如果這樣的Q峰離金屬只有0.5A,很顯然他不可能是什么原子,其是由熱振動或測試條件造成的,所以要在論文的晶體結(jié)構(gòu)實(shí)驗(yàn)部分特殊說明。這樣的殘余峰有時(shí)可以通過刪除壞的衍射點(diǎn)消除。就是在精修XL時(shí)最后一行給出的數(shù)據(jù)。the highest peak ,the minimum peak 。 |
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