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lingznpmg

铁虫 (小有名气)

[求助] NBO问题

这几天在看NBO,发现几个问题:
     1.http://muchong.com/bbs/viewthread.php?tid=2426807
        这个帖子里,sp45.88,这种情况合理吗?是什么原因造成的?
     2. http://muchong.com/bbs/viewthread.php?tid=1160927
        这个帖子里9楼作者说
    【注意,关键在这里:对开壳层计算,不能直接用total的结果(可能程序有问题),
     而是应该用 (alfa+beta)*2 . 我计算的结果是:
     Total:1.5185
         alfa :0.2620   (with around 1 electron  in BD and 0 electron in BD*)
         beta :0.7521   (with around 3 electrons in BD and 0 electron in BD*)
         用 (alfa+beta)*2=2.0282, 刚好是O2三重态的键级。】

      而最后一行又说:【nbo 算的出键级的,在Natural Orbital Bond下,要把A轨道和B轨道的加起来在求平均值,就是键级】

问题:开壳层的键级究竟该怎么算?还有总的Wiberg bond index matrix in the NAO 用什么用?

    3. 对同一分子,Mulliken轨道和NBO轨道顺序和能量可能都不一样,那在分析电子转移,电子得失、成键信息和反应活性时应该怎么使用?

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