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Systematic Absence Violations ϵͳÏû¹â³åÍ»£ºÕâÊÇ·´Ó³Ëù¶¨¿Õ¼äȺÊÇ·ñºÏÀí£¬Õâ¸öÖµÒ»°ãҪСÓÚ10£¬Èç¹ûÆ«´ó¾Í¿ÉÄÜÊÇÄãµÄ¿Õ¼äȺѡÔñÓÐÎÊÌâ¡£ºÃµÄÑÜÉäÊý¾Ý»áÊÇ0.

Bad Equivalents ´ó¸ÅÊDz»ºÃµÄµÈЧµÄÒâ˼£º ±íʾ±¾À´ÓÐͬÑùintensity µÄÓ³É䣬¿ÉÒÔûÓС£ Õâ¸öÖµÓ¦¸ÃСÓÚ100. ºÃµÄÑÜÉäÊý¾Ý»áÊÇ0.Èç¹ûÕâ¸öÖµ´óÓÚ100ÁË£¬¶øÇÒÄãµÄ¾§ÌåÖÐÓдóÓÚ18ºÅµÄÖØÔ­×Ó£¬»òÕßÊÇÄãµÄ¾§ÌåÊÇÕë×´»ò·Ç³£±¡µÄƬ¾§£¬´óÓÚ100ÊÇ¿ÉÒÔ½ÓÊܵġ£Ïà·´£¬Èç¹ûûÓдóÓÚ18µÄÖØÔ­×Ó£¬¾§ÌåÒ²²»ÊÇÕë×´»ò·Ç³£±¡µÄƬ¾§£¬ÄÇô1£¬ ÄãÔÚÔËÐÐXPREPµÄʱºòÓÐЩ´íÎó²úÉú£¬ÐèÒª×ÐÏ¸ÖØÐÂÀ´×ö£»2£¬ÑÜÉúÌ«Èõ¡£Ò²¿ÉÒÔͨ¹ýsanit plusÀ´É¾³ýһЩ¸ß½Ç¶ÈµÄÖµÊÔÊÔ¡£

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Systematic Absence Violations are reflections that should have intensities of zero for the selected space group but did not. The number of such violations should be less than 10. If it is greater than ten, make a note of this, and continue with next step¡£

Bad Equivalents are pairs of observed reflections that should have the same intensity but do not. If the number is less than 100, skip to next step¡£If the number of bad equivalents is greater than 100, but if your crystal contains heavy scatterers (for Mo radiation, atoms with atomic numbers greater than 18), or if the crystal was a needle or a very thin plate, skip to next step. If the number of bad equivalents is greater than 100, there are no heavy scatters, and the crystal was not a needle or thin plate, then either (a) you have done something wrong in XPREP and should re-run XPREP more carefully, or (b) the diffraction pattern is weak, and you should ask an expert about whether to use the SAINT program to delete high angle data.
There is a will,there is a way.
3Â¥2009-07-23 06:45:03
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