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Homework Statement
Explain why the 1s2s (3P) excited state of helium is metastable?
Homework Equations
Spin multiplicity = 2S+1
J = |L-S|, |L-S|+1,...,L+S, L+S-1,..
Selection Rules:
ΔL = +/-1
Δm = 0,+/-1
Δs = 0
state must change parity
Δj = 0,+/-1
j = 0 -> j' = 0 NOT ALLOWED
The Attempt at a Solution
2S+1 = 3 so S = 1
L = 0
J = |L-S| = 1 (only one value I think)
How do I tell whether 1s2s (3P) excited state of helium is metastable?
Note: (The 3 is superscript in front of P)
Any help would be great, thanks!
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