Question

Modern Physics: Atomic Physics Identify the following transitions as either allowed or forbidden, and justify your...

Modern Physics: Atomic Physics

Identify the following transitions as either allowed or forbidden, and justify your responses based on selection rules.

a. 3s ? 1s
b. 4s ? 2p
c. 3d ? 2s
d. 4f ? 3p

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Answer #1

Quantum Mechanics predicts that in a centrally symmetric potential, the transitions can occur only between states of different parities, that is, P to P or S or S or any such transitions are not allowed, but transitions from P to S or P to D or as such are allowed. Based upon above laws, the question can be answered neatly, as follows:

(a) Not allowed because states are of same parity, S

(b) Allowed because states are of different parity(S and P)

(c)Allowed(D and S)

(d)Allowed(F and P)

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