谢谢楼上各位，以下回答是我在RG上提问的答案，以供参考，目前为止，得出的结论是：
体系所有电子轨道量子数之和的奇偶性确定体系的宇称
“The short answer is that the parity of the electronic wavefunction is the parity of the l-quantum number. For a many-electron atom, you then have to sum all the l's. Thus, teh parity is $(-1)^{\Sum_i l_i}$.”
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