J-values and their orientation

[Elisa Tassan-Din]

J = orbital angular momentum (L) + spin angular momentum (S)

When J=0, S and L are parallel but point in the opposite direction. J=|1-1|=0
When J=1, S and L are perpendicular. J=|1-0|=|0-1|=1
When J=2, S and L are parallel and point in the same direction. J=|1+1|=0

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