hey,(adsbygoogle = window.adsbygoogle || []).push({});

I was asking myself a few questions about the selection rules for EM dipole radiation which occurs if electrons "jump" into lower bound states according to the selection rules.

now I know that the full explanation about matrix elements of the dipole operator comes from fermi's golden rule... which I will learn next semester... but apart from that...we have 2 considerations:

1) Parity... parity has to change... ok i got this

2) Conservation of angular momentum:

we have

j_{i}=j_{[tex]\gamma[/tex]}+j_{f}

and we assume that

j_{[tex]\gamma[/tex]}=1

WHY is this angular momentum 1??

I guess it has something to do that the cartesian components of the Dipole operator are proportional to linear compinations of the spherical harmonics Y_{1,m}but I don't get this point at all....

I'd highly appreciate your help!

thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Selection Rules for EM Dipole Radiation

**Physics Forums | Science Articles, Homework Help, Discussion**