Nomenclature of Atom States



 

Multiplicity (Spin S ≥ 0) 
¯ 		 Total kinetic moment
¯
2S + 1 L J
­ 
Orbital moment
L = 0, 1, 2, 3, 4... 
S, P, D, F, G 
 

Examples:
 
2D5/2 it's called: doublet    D   five halves

the state with S = 1/2, L = 2 and J = 5/2 
6H13/2 it's called: sextet   H   thirteen halves

the state with S = 5/2, L = 5 and J = 13/2
1S0 it's called: singlet   S   zero

the state with S = 0, L = 0 and J = 0

The kinetic moments S = 1 and L = 1 can principally give total kinetic moments J = 0, 1, 2. The possible states are then the following:

3P0,   3P1,  3P2

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