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Forums
Physics
Quantum Physics
Transition in LS-coupling confusion
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[QUOTE="joris_pixie, post: 3936614, member: 136839"] [b]Transition in LS-coupling confusion ! :)[/b] Hello :) Lets take for example a 2 electron system with l[SUB]1[/SUB],s[SUB]1[/SUB] and l[SUB]2[/SUB],s[SUB]2[/SUB]. One electron changes energy due to electric dipole. I understand the rules for electrons in electric dipole transitions: 1) Δl = +/- 1 (parity flips) 2) Δm[SUB]l[/SUB] = 0 or +/- 1 3) Δm[SUB]s[/SUB] = 0 But I don't get a selection rule for the terms ! One of the acceptable transitions is : ΔL = 0 But if (1) Δl can't be 0 and (2) Δm[SUB]l[/SUB] = 0 or +/- 1 how is this possible ? :) Because to my understanding [B]L[/B] = [B]l[/B][SUB]1[/SUB] + [B]l[/B][SUB]2[/SUB] in vector form. [/QUOTE]
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Physics
Quantum Physics
Transition in LS-coupling confusion
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