Possible Dipole Transitions from 5p to 4s in Potassium

[Max Eilerson]

An electron is excited to the 5p state in potassium, list all the possible dipole transitiosn that can occur as the electron relaxes to the 4s level. (Ignoring fine structure effects)

I've got

5p -> 5s -> 4p -> 4s
5p -> 4s

I'm not sure whether to also include

5p - > 3d -> 5s
3d -> 4p
3d -> 4s

 

[Max Eilerson]

All correct except the 5p -> 3d, as l changes by 2. I knew that transitions needed change in l =+- 1 but thought the 5p and 3d states were interchangeable?