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2S+1L term---an S value and an L value determined;
2S+1LJ level---S, L and J values are determined;
S, L, J and MJ determines a single state.
例子:
p2为configuration;
1S, 1D, 3P为terms;
1S0, 1D2, 3P2, 3P1, 3P0为levels;
一个level可以再根据MJ的不同而细分为几个states.
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