Consider the 1s np 3 P 1s nd 3 D transition in He. Draw an energy-level
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Consider the 1s np 3P → 1s nd 3D transition in He. Draw an energy-level diagram, taking the spin-orbit coupling that splits terms into levels into account. Into how many levels does each term split? The selection rule for transitions in this case is ΔJ = 0, ± 1. How many transitions will be observed in an absorption spectrum? Show the allowed transitions in your energy diagram.
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For the 3 P term L 2 S 1 and J can have the values 2 1 and 0 ...View the full answer
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