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furusheng(½ð±Ò+5): лл µ«ÊÇÎÒÒ²Óп´µ½ÎÄÏ×µ¼±¨µÄchi2СÓÚ1µÄ°¡£¿ 2011-10-16 00:12:00
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8Â¥2011-10-15 15:54:45
ultraq
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furusheng(½ð±Ò+20): лл ÎÒÈ¥¿´¿´ 2011-10-16 12:38:01
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If the background has been subtracted, yi(obs) is the net intensity after subtraction, but if the background is refined, yi(obs) [and yi(calc)] is likely to include the background contribution. In the latter case, a high background will automatically produce a low Rwp value, because a significant part of the intensity is accounted for by the background function. Thus, the comparison of profile R values from different kinds of powder diffraction experiments can be extremely misleading. For example, Rwp for neutron TOF data are often quite small (e.g. a few %), while those for laboratory X-ray data are larger (e.g. ~10%). ´ÓÕâ¶Î»°Àï¿ÉÒÔÖªµÀÄãµÄRwpΪʲôÄÇôµÍµÄÔÒòÊÇÄã±³µ×ºÜ¸ß |
10Â¥2011-10-16 04:16:37
lqingh506
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2Â¥2011-10-14 07:47:04
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3Â¥2011-10-14 08:49:15
furusheng
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4Â¥2011-10-14 09:11:25
furusheng
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5Â¥2011-10-14 09:14:23
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6Â¥2011-10-14 09:25:49
haisenburg
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drg1984(½ð±Ò+1): »¶Ó·¢Ìû½»Á÷£¡ 2011-10-23 16:26:50
drg1984(½ð±Ò+1): »¶Ó·¢Ìû½»Á÷£¡ 2011-10-23 16:26:50
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ÄãÕâ¸ö Ka2/Ka1 µÄ±ÈÖµÊÇ1Â𣬠ºÃÏñÓÃCuµÄ»°£¬ Ò»°ã¶¼ÊÇ0.5µÄ |
7Â¥2011-10-14 10:10:11
ultraq
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drg1984(½ð±Ò+1): »¶Ó·¢Ìû½»Á÷£¡ 2011-10-23 16:26:57
drg1984(½ð±Ò+1): »¶Ó·¢Ìû½»Á÷£¡ 2011-10-23 16:26:57
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ÄãÕâ¸ö̫СÁË0.144£¬Äã¿´¿´ÏÂÃæÎÄÏ×µÄ˵Ã÷£¬Ï£Íû¶ÔÄãÓаïÖú¡£ J. Appl. Cryst. (1999). 32, 36-50 chi2 is also quoted quite often in the literature, should approach 1. If the data have been `over-collected' (i.e. errors are no longer dominated by counting statistics), Rexp will be very small and chi2 for a fully refinned structure much larger than 1. Conversely, if the data have been `under-collected' (i.e. collected too quickly), Rexp will be large and chi2 could be less than 1. Strange chi2 values can also arise from data for which the e.s.d.'s of the counts have been incorrectly calculated (e.g. counts given as counts per second are assumed to be the absolute counts). |
9Â¥2011-10-16 02:03:07













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