# Obtain the selection rule for as follows: (a) Derive the commutation relation Use this, and (in the final step) the fact that r.L = r. (rxP) = 0, to demonstrate that The generalization from z to r is trivial. (b) Sandwich this commutator between (n' 'm'| and |n m). and work out the implications [. [2.r]] -21 (02 +2).

Chapter 11, Problems #15

Obtain the selection rule for Δℓ as follows:

(a) Derive the commutation relation

Use this, and (in the final step) the fact that r.L = r. (rxP) = 0, to demonstrate that

The generalization from z to r is trivial.

(b) Sandwich this commutator between (n'ℓ 'm'| and |nℓ m). and work out the implications

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**Related Book For**

## Introduction To Quantum Mechanics

3rd Edition

**Authors:** David J. Griffiths, Darrell F. Schroeter

**ISBN:** 9781107189638