1.

Find out which of the following transitions are forbidden by the selection rules: .^(2)D_(3//2)rarr.^(2)P_(1//2),.^(3)P_(1)rarr.^(2)S_(1//2),.^(3)F_(3)rarr.^(3)P_(2), .^(4)F_(7//2)rarr.^(4)D_(5//2)

Answer»

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SOLUTION :Selection rules are `Delta=0`
`DeltaL=+-1`
`DeltaJ=0, +-1(no 0rarr 0)`
Thus `.^(2)D_(3//2) rarr .^(2)P_(1//2)` is ALLOWED
`.^(3)P_(1)rarr .^(2)S_(1//2)` not allowed
`.^(3)F_(3)rarr.^(3)P_(2)` is not allowed `(DeltaL=2)`
`.^(F_(7//2)rarr .^(4)D_(5//2)` is allowed .


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