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

Answer:

(1)$\Delta S=0$

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

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.