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Is the transition 2S1/2 to 2P1/2 allowed or forbidden based on selection rules?

Is the transition 2S1/2 to 2P1/2 allowed or forbidden based on selection rules?

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Answer #1

#  2S1/2 to 2P1/2 is spin allowed process.

Because

# transition between S (triplet) to P ( triplet) IS ALLOWED.

# According to selection rule, L must be 1 for laporte allowed process.

# Therefore transition from s to p is laporte allowed process.

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