Term Symbol Parity
The parity of a term symbol is calculated as
where li is the orbital quantum number for each electron. In fact, only electrons in odd orbitals contribute to the total parity: an odd number of electrons in odd orbitals (those with an odd l such as in p, f,...) will make an odd term symbol, while an even number of electrons in odd orbitals will make an even term symbol, irrespective of the number of electrons in even orbitals.
When it is odd, the parity of the term symbol is indicated by a superscript letter "o", otherwise it is omitted:
- 2Po
½ has odd parity, but 3P0 has even parity.
Alternatively, parity may be indicated with a subscript letter "g" or "u", standing for gerade (German for 'even') or ungerade ('odd'):
- 2P½,u for odd parity and 3P0,g for even.
Read more about this topic: Term Symbol
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