- #1
AlonsoMcLaren
- 90
- 2
While I am reviewing my undergrad physics for qualifying exam, I became confused about the numerous selection rules.
(1) We have the selection rules for spontaneous emission in a hydrogen atom: Δl=±1 ,Δml=0,±1. This rule is the easiest to understand by evaluating <n'l'm'|z|nlm>
(2) We have the selection rules for Zeeman effect.
Δj=0,±1 ,Δmj=0,±1. I don't understand the reasons for these rules.
(3) We also have the selections rules for a helium atom where one of its electron is excited: (Modern Physics by Randy Harris, Section 8.9): Δl_total=±1, Δs_total=0, Δj_total=0,±1 (0->0 forbidden). I am totally no clue on this one.
(4) What about a hydrogen atom, without external magnetic field, but in contrast to (1), we are now considering fine structure so the good quantum numbers are n,l,j,mj?
(1) We have the selection rules for spontaneous emission in a hydrogen atom: Δl=±1 ,Δml=0,±1. This rule is the easiest to understand by evaluating <n'l'm'|z|nlm>
(2) We have the selection rules for Zeeman effect.
Δj=0,±1 ,Δmj=0,±1. I don't understand the reasons for these rules.
(3) We also have the selections rules for a helium atom where one of its electron is excited: (Modern Physics by Randy Harris, Section 8.9): Δl_total=±1, Δs_total=0, Δj_total=0,±1 (0->0 forbidden). I am totally no clue on this one.
(4) What about a hydrogen atom, without external magnetic field, but in contrast to (1), we are now considering fine structure so the good quantum numbers are n,l,j,mj?