The raising and lowering operators change the value of m by one unit:
[4.120]
where is some constant. Question: What is if the eigenfunctions are to be normalized? Hint: First show that is the hermitian conjugate of L± (since Lx and Ly are observables, you may assume they are hermitian ... but prove it if you like); then use Equation 4.112. Answer:
[4.121]
Note what happens at the top and bottom of the ladder (i.e., when you apply L+ to or L- to ).
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