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chenjing3636

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In the description of the X-ray experiments, the authors write that the "O- and N-bound H atoms were first determined in difference Fourier maps and then fixed in calculated positions."  I do not understand the logic here.  Why locate the H-atoms, only to put them in calculated positions afterwards?  Why were these H atoms not refined in the positions found from the difference maps?
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chenjing3636: ½ð±Ò+30, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-07-21 14:58:14
¸öÈËÈÏΪ£¬Éó¸åÈËÌá³öµÄlogicÎÊÌ⣬ÊÇÒòΪÄã»ìÏýÁËÁ½¸ö¸ÅÄÊ×ÏÈ  O- and N-bound H atoms were first determined in difference Fourier maps  Ó¦¸ÃÊÇÔÚN¡¢OÔ­×Ó¸½½üÖ¸ÈÏ»¯Ñ§»·¾³ºÏÀíµØQ·åΪÇâÔ­×Ó£¨²»ÖªµÀÄãÊDz»ÊÇÕâô´¦ÀíµÄ£©£¬²¢ÇÒ¼ÓÏÞÖÆÐÔÃüÁÐÞ£¨¾ÍÊǺóÃæµÄfixd ²¿·Ö£©£¬ÕâÊDzîÖµFourierºÏ³É·¨ÕÒÇâÔ­×Ó£¬È»ºófixd in calculated positionsÎÒ¾õµÃÕâ¸ö calculated Ó¦¸ÃÊÇÀíÂÛ¼ÓÇâ²ÅÓеĸÅÄÕâÁ½¸ö¸ÅÄîÄã·ÅÔÚÒ»ÆðÁË£¬Éó¸åÈ˲Żá˵ I do not understand the logic here£¬Ò²¾ÍÓÐÁ˺óÃæÁ½¸öÎÊÌâÁË
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