1楼gaussian手册上有详细的说明，原话是：
There are two ways to calculate the partition function, depending on where you choose
the zero of energy to be: either the bottom of the internuclear potential energy well, or
the rst vibrational level. Which you choose depends on whether or not the contributions
arising from zero-point energy will be coputed separately or not. If they are computed
separately, then you should use the bottom of the well as your reference point, otherwise the
rst vibrational energy level is the appropriate choice.
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