PHY 342

Welcome to PHY 342 – Quantum Mechanics II homepage
energy3D
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

    • Announcement Sep 2, 2025: Class schedule: MWF 11-12; SENG 306
    • Syllabus
    • Useful math formulas
    • 2025 Nobel Prize for Physics goes tunneling on macroscopic scales
    • Asynchronous video: Oct 8 Wed – Circular atomic states (spot the error before I did) (12:28)
    • Class recording: Oct 31 Fri: First-order perturbation theory || Oct 24 Fri: Fermi energy ||Sep 15 Mon: Hydrogen eigenenergy || Sep 12 Fri: atomic units
    • Concepts: Identical particles || Coupled states representation || Stern-Gerlach || Spin half 3 || Spin half 2 || Spin half 1 || Hydrogen 2 || Hydrogen 1

    • Homework 4a (due Sep 15, M)
    • Homework 4b (due Sep 22, M)
    • Homework 4c (due Sep 29, M)
    • Homework 4d (due Oct 22, W)
    • Homework 5 (due Oct 27, M)
    • Homework 6a (due Nov 10, M)

  • 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.
    • Energy levels in a double-well and other potentials 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.