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
    • Asynchronous video: Wed Nov 27 – The helium atom symmetry (16:08) || Nov 2 Sat – Band structure (18:24) || Sep 30 Mon – Circular atomic states (spot the error before I did) (12:28)

    • Class recording: Dec 9 Mon: Evolution and pictures || Dec 6 Fri: Spontaneous transitions and lifetime || Dec 4 Wed: Optical transition || Dec 2 Mon: First-order transition rate || Nov 25 Mon: Tunneling || Nov 22 Fri: WKB approximation || Nov 20 Wed: Computation of <1/r12> || Nov 18 Mon: Helium ground state || Nov 15 Fri: VP treatment of SHO || Nov 13 Wed: Variational principle || Nov 6 Wed: Spin-orbit interaction || Nov 4 Mon: Relativistic correction || Nov 1 Fri: Degenerate PT || Oct 29 Tue: Perturbation theory || Oct 28 Mon: Fermi gas || Oct 25 Fri: Periodic table || Oct 23 Wed: IPA and screening || Oct 21 Mon: Helium symmetry || Oct 18 Fri: Pauli exclusion principle || Oct 16 Wed: Spin singlet and triplets || Oct 9 Wed: Spin in magnetic fields || Oct 7 Mon: Diff basis sets || Oct 2 Wed: Spin 1/2 || Sep 30 Mon: Spin || Sep 27 Fri: Ang. mom. ladder || Sep 25 Wed: Angular momentum || Sep 23 Mon: Prob. dist. & expect. values || Sep 20 Fri: Radial wave function || Sep 18 Wed: Hydrogen energy levels || Sep 16 Mon: Atomic units || Sep 13 Fri: Inf. spherical well || Sep 11 Wed: Radial Sch eqn || Sep 9 Mon: Spherical harmonics || Sep 6 Fri: Separa in Spherical Coords || Sep 4 Wed: Sch Eqn in 3D
    • Announcement Sep 3, 2024: Class schedule: MWF 10-11; SENG 102
    • Syllabus
    • Useful math formulas
    • Concepts: Time-dependent PT || VP-WKB approximation || Perturbation 3 || Perturbation 2 || Perturbation 1 || Identical particles || Coupled states representation || Stern-Gerlach || Spin half 3 || Spin half 2 || ChatGPT spin || Spin half 1 || Hydrogen 2 || Hydrogen 1

    • Homework 4a (Due Mon/Sep 16)
    • Homework 4b (Due Mon/Sep 23)
    • Homework 4c (Due Mon/Sep 30)
    • Homework 4d (Due Mon/Oct 7)
    • Homework 5 (Due Mon/Oct 28)
    • Homework 6a (Due Fri/Nov 8)
    • Homework 6b (Due Mon/Nov 25)
    • Homework 7&8 (Due Mon/Dec 9)

  • 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.