# PHY 342

Welcome to PHY 342 – Quantum Mechanics II homepage

We will use this space to post extra course materials, like homework, solutions, announcements, etc.

If you have any interesting and related links, we can add them too.

**Homework, recordings, and announcements**- Asynchronous video: Sep 22 Fri – Circular atomic states (spot the error before I did) (12:28) || Sep 11 Mon – Inf. sph. well and sph. Bessel functions (9:06)
- Homework 4b(Due Sep 15); Dan’s code for q4.9
- Homework 4c(Due Sep 22)
- Homework 4d(Due Sep 29)
- Class recording: Sep 25 Mon: Eigenfuncs of ang. momentum || Sep 22 Fri: Angular momentum ladder || Sep 20 Wed: Ionization potential, angular momentum || Sep 18 Mon: <V>, <T> and Virial theorem; Degeneracy || Sep 15 Fri: Radial expectation values and energy diagram || Sep 13 Wed: Radial wf & probability, graphically and computationally || Sep 11 Mon: Radial wf and allowed energies of hydrogen || Sep 8 Fri: Units and Radial Sch Eqn || Sep 6 Wed: Review of Sch Eqn in 3D
- Announcement Sep 5, 2023: Class schedule: MWF 11-12; SENG 102
- Syllabus
- Useful math formulas
- Concepts: Hydrogen 1

**Codes and other links**

Most codes are in the Jupyter notebook format. You can download it and open it with Jupyter. If you do not have access to a Jupyter installation or server, you can go to try.jupyter.org on the cloud, and upload the notebook there.

**Note:**Due to some weird, nonsensical rule of the site disallowing the “.ipynb” file extension, I have the programs in .zip and plain .txt formats. If you download a zip file, unzip it to recover the .ipynb file.**If you download the .txt file (right click then save), just rename “somefile-ipynb.txt” to “somefile.ipynb”.**- Local Jupyter/Python server (Thanks to CSCDR)
- cocalc.com (only if no other alternative)
- Visualizing and manipulating spherical harmonics in zip and in txt format.
- Spherical Bessel functions and eigenstates of infinite spherical well in zip format.
- Radial wave functions and atomic orbital visualization in zip format.
- Energy diagram in 3D (nlm) in zip format.
- Vector model of quantized angular momentum in zip format.
- Computation of integrals in variational treatment of helium in zip format.
- Quantum transition amplitude in the 1D box, using Sympy in zip format.