Bound Systems and Spectra

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Presentation transcript:

Bound Systems and Spectra Chp Q7,8

Key Concepts… Energy Eigenstates are never “exact” – time evolution rule implies that high energy states “evolve” to lowest possible states Energy level diagrams help to “conceptualize” this Particles have an intrinsic property called spin.

Key Concepts… Spin and orbital angular momenta interact in a complex way to give spin-orbit coupling and help explain the selection rules of atomic physics/chemistry

Examples… Stern-Gerlach Experiment Space quantization Spin is an intrinsic “angular-momentum-like” property Fermions are “spin-one-half” particles Bosons are integer spin particles Question: electrons, protons and neutron are all spin-1/2. What is “odd” about the neutron as a spin-1/2 particle?

Examples… 21 cm line emission from neutral Hydrogen To small an energy to be explained by energy level transition

From Carrots to Quantum Physics! Why are carrots orange?