Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 1

Quantum MechanicsPhysics 237

Frank L. H. Wolfs Department of Physics and Astronomy

University of Rochester

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 2

Announcements

• This lecture was recorded on March 17, 2020.

• The schedule for the rest of the semester is not clearlydefined.

• I am not sure yet if this lecture will “happen” before or afterExam # 2.

• No matter what the schedule ends up being, I am committedto help you learn the material we need to cover. You maynot be able to walk into my office, but I am only a mouseclick away.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 3

The Spin-Orbit Interaction.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 4

The Total Angular Momentum.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 5

Adding orbital and spin angular momentum.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 6

Adding orbital and spin angular momentum.l = 2, s = 1/2

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 7

3 Minute 20 Second Intermission.

• Since paying attention for 1hour and 15 minutes is hardwhen the topic is physics,let’s take a 3 minute 20second intermission.

• You can:• Stretch out.• Talk to your neighbors.• Ask me a quick question.• Enjoy the fantastic music.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 8

Predictions for the Hydrogen Atom.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 9

Transitions between different states.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 10

Parity.

Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester, Lecture 15, Page 11

ENOUGH FOR TODAY?