Question

If light is used to promote the electron, what are the selection rules for the initial and final spin and orbital angular momentum? Explain clearly.

Answer 1

(1)
`\Delta S=0`

(2)
`\Delta L=0, +1,-1` but
`J=0 to J=0` transition not allowed.

Step-by-step explanation:

Atoms can be described by the quantum number n, spin quantum number S, angular momentum quantum number L, and total angular momentum quantum number J. Based on approximation Russel- Saunders electron coupling, the atomic term symbol can be written as
`L_(J) ^(2S+1)`.

The conditions or selection rule to promoting the electron are discussed below:

(1) The total spin should not change that is
`\Delta S=0`.

(2) The total angular momentum change should be,
`\Delta L=0, +1,-1` but
`J=0 to J=0` transition not allowed.