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[求助] 求助关于高斯软件计算稳定结构的问题

The aromatic C2 Im cation (Figure 1) was found to be a planar minimum on the potential energy surface (PES). A methyl group was then added to one of the nitrogen atoms to give methylimidazolium (Mim) in one of two possible orientations of Cs symmetry. Structure Mim 2 has one imaginary frequency (methyl rotation, 100i cm 1) of irreducible representation A′′ and is higher in energy than the stable Mim 1 structure (Table 1). Given this result, a second methyl group bound to the other nitrogen atom should have the same orientation as in Mim 1, and, indeed, a stable C2 structure for dimethylimidazolium (Dmim) was found.
     请各位高人指导,翻译一下这一段吧。图在附件中。
     A methyl group was then added to one of the nitrogen atoms to give methylimidazolium (Mim) in one of two possible orientations of Cs symmetry. 这句话不是很清楚。当第一个甲基加上的时候,是靠自己旋转键角吗?
       在不同的基组下计算的稳定结构不是一样的是吗,那就要根据经验对不同的物系选择不同的基组吗?
    谢谢,请各位高手指点!
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