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kakumon

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[ÇóÖú] ¼±£¡Éó¸åÈ˹ØÓÚ¾§Ìå½âÎöµÄÌáÎÊ ÒÑÓÐ1È˲ÎÓë

¡°- First of all, extracting the RES and HKL from the CIF with ShredCIF gives a checksum error, which is also detected by checkCIF (resulting in the level G alert N.O.K. _shelx_res_checksum found in CIF). This means that the data in the CIF have been accidentally or deliberately manipulated after the final refinement.

- Moreover, the weighting scheme used (WGHT    0.000000   20.000000) does not make a lot of sense to me and omitting a long list of reflections - obviously in hunt for a lower R factor - is by no means justified here. This is actually data manipulation.

- Refinement as inversion twin using TWIN and BASF parameters is not recommended in the absence of significant anomalous scattering. The Flack x parameter of 0.23(15) you report is not reliable and unrealistic for purchased enantiopure material. After a re-refinement against all data using the suggested weighting scheme results in R1 = 0.1053 and Flack 0.08(6).¡±

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xwnail2003

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2Â¥2017-11-09 23:16:06
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kakumon

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2Â¥: Originally posted by xwnail2003 at 2017-11-09 23:16:06
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3Â¥2017-11-10 08:13:59
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ÎÒÏë¸ü¶®Äã29

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3Â¥: Originally posted by kakumon at 2017-11-10 08:13:59
Õâ¸ö¾«ÐÞµÄÎÊÌâ³öÔÚÁËʲôµØ·½£¿¡°OMIT¡±Ö¸ÁîÒ²ÊDz»ÔÊÐíʹÓõÄô£¿Éó¸åÈËÒòΪÕâ¸öÎÊÌâÒª¾Ü¸å¡£...

omit¿ÉÒÔÓã¬ËûµÄÒâ˼ÊÇomitting a long list of reflections - obviously in hunt for a lower R factor£¬ÓÃÁËÌ«¶àµÄomitÃüÁ½ö½öÊÇΪÁË×·Çó½ÏµÍµÄRÖµ£¬Õâ¾Í²»ºÏÀíÁË£¬
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4Â¥2017-11-10 08:57:19
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kakumon

½ð³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
4Â¥: Originally posted by ÎÒÏë¸ü¶®Äã29 at 2017-11-10 08:57:19
omit¿ÉÒÔÓã¬ËûµÄÒâ˼ÊÇomitting a long list of reflections - obviously in hunt for a lower R factor£¬ÓÃÁËÌ«¶àµÄomitÃüÁ½ö½öÊÇΪÁË×·Çó½ÏµÍµÄRÖµ£¬Õâ¾Í²»ºÏÀíÁË£¬
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