# Term Symbols

1. Jan 2, 2009

### filippo

Atoms have Terms Symbols such as S (L=0), P (L=1), D (L=2), etc...In case of molecules, L no longer exists as other symbols are uesd: which ones?

2. Jan 2, 2009

### olgranpappy

I often see: Sigma $\Sigma$, Pi $\Pi$, etc. Often with a subscript g or u. The meaning are given in various books. For example, Landau and Lifgarbagez "Quantum Mechanics".