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Bound Systems and Spectra

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Presentation on theme: "Bound Systems and Spectra"— Presentation transcript:

1 Bound Systems and Spectra
Chp Q7,8

2 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.

3 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

4 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?

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

6 From Carrots to Quantum Physics!
Why are carrots orange?

7

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