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staphlee
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yyh_shd885(½ð±Ò+3,VIP+0): 7-15 11:50
sanko211(½ð±Ò+3,VIP+0):¸ÐлÈÈÐĵijæÓÑ£¬»¶Ó³£À´¾§Ìå°æ 7-15 11:33
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½¨×hÄã¿´¿´crystal structure refinementµÄµÚ31í“Ï·½....‘ªÔ“•þÓÐŽÍÖú?? (ÎÒÒ²ÕýÔÚŒW...ŽÍÄãÍÆÍÆ) However, when good low-temperature data are available, the hydrogen atoms can frequently be found in the difference Fourier synthesis and their coordinates can simply be taken from the list of residual density maxima at the end of the .res file. The so found hydrogen atoms can either be refined using AFIX constraints, or in a semi-freeway by only restraining the X−−H distances using DFIX. This restraint requires the crystallographer to specify a target value for the distance. As explained in Section 3.1, apparentX−−Hdistances in X-ray structures are slightly longer at lower temperature, but altogether significantly shorter than the true distances between the nuclei. The .lst file contains a table with appropriate X−−H bond distances at the temperature specified in the .ins file.4 The target values for DFIX can be taken from there. The third example in this chapter deals with such a case. |
2Â¥2009-07-15 11:33:05
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3Â¥2009-07-15 11:41:34
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4Â¥2009-07-15 11:45:09
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5Â¥2009-07-15 11:45:49
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6Â¥2009-07-15 11:48:33
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7Â¥2009-07-15 11:51:42
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