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[求助] MS的使用

大神们我看到一篇文献中计算爆炸反应的爆能,反应为:
      CuC12H12N26O6—— CuO+5H2O+2/3NH3+38/3N2+12C
文献中给出的条件如下:
      The extended polymeric backbone structures of NHN, NHP,and CHP prompted the use of all calculations in periodic supercells representing the smallest repeating unit of the explosive. This also accounts for the contribution of the cohesive energy (i.e., heat of sublimation) of the crystalline solid. The DFT code DMol3, was employed, with the electronic wave functions expanded in a double-numeric polarized double-numeric polarized basis set, while the exchange and correlation effects
were incorporated through the gradient-corrected PBE functional. For a periodic calculation, an accurate Brillouin-zone sampling of the reciprocal lattice was also necessary. This was ensured by summation over a finite set of K-points chosen according to the Monkhorst−Pack scheme with a grid spacing of 0.05Å−1        
我用MS7.0的dmol3模块设置了 PBE泛函 DNP基组 和0.05,反应物还没优化完 ,但是我有几个问题不太明白:
1. CuO我是直接调用的MS里面的,每个盒子里有4个CuO。我想用优化出来的能量除以4得到单个的能量,但是计算出来后与文献的不一样,差距很大
2.计算出来的水和氮气也与文献给出的有点差距但是比较小,在小数点后第三位
3.我想问一下爆炸反应的产物应该怎么写呢,我看文献中提到看一个cheetah,但是没有看不太明白

由于本人小菜鸟一枚希望知道的大神们指导一下,帮忙看一下问题出在哪,是不是有的选项没设置,
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