Quantum Mechanics-I A course given at University of Hyderabad Summer Semester May14 - July10 (2018) |
This course aims to introduce wave mechanics with minimal mathematics preparation. No vector spaces are required as prerequisite.
The postulates are adopted for a wave mechanical treatment ofa single particle moving in a potential. Formal vector spaces and abstract approach can be taken up at a later stage of learning.
This course is suitable for those who want to come to Schrodinger equation and applications as quickly as possible.
This course will consist of following parts.
Part-A Rise of Quantum Theory
Inadequacy of classical theories. Landmarks in rise of quantum theory.
Review of classical and quantum particle and wave concepts. Uncertainty
principle. The changes and new concepts brought in by quantum theory.
Wave mechanics of a single point particle.
Part-B Wave Mechanics of a Point Particle
Optics and mechanics analogy.
Time dependent Schrodinger equation. Conservation of probability.
Interpretation of wave function as probability amplitude. Probability
current density. Schrodinger equation for a charged particle. Time
reversal. Free particle. Solution of time dependent Schrodinger equation
for a free particle. Wave packets. Periodic boundary condition and box
normalization. Free particle in two and three dimensions.
Eigenfunctions of momentum. Momentum space wave function. Quantum mechanics
of a spin half particle.
Part-C Motion of a particle in potential well
Particle in a box. Boundary and matching conditions on wave function. Energy
eigenvalues and eigenfunctions. Harmonic oscillator energy eigenvalues and
eigenfunctions. Periodic potential
Reflection and transmission through a potential well. Barrier tunnelling.
General properties of motion in one dimension.
Part-D Spherically symmetric potentials in three dimensions
Conservation of angular momentum. Reduction of two body central force
problem to one body with reduced mass. Separation of variables in
spherical polar coordinates.
Solution of radial equation for free particle and piece wise constant
potentials. Hydrogen atom energy levels and wave functions. Accidental
degeneracy of Coulomb energy levels.
Part-E General principles of quantum mechanics
The structure of physical theories.
Thought experiments and superposition principle in quantum mechanics. States
and dynamical variables in quantum description of a physical system.
Probability and average value. Canonical quantization. General form of
uncertainty principle. Time evolution. Schrodinger, Heisenberg, and Dirac
Pictures in quantum mechanics. Density matrix. Identical particles
Part-F Working with representations
Compatible variables. Commuting observables. Complete
commuting set. Functions of operators and matrices. Simultaneous eigenvectors
as basis in Hilbert space. State vectors as set of probability amplitudes.
Coordinate and momentum representations as examples. Spin matrices and their
properties. Wave function of a particle with spin.
Part-G Matrix mechanics
Harmonic oscillator energy levels. Angular momentum eigenvalues and
eigenfunctions. Addition of angular momenta
Part-I Approximatin Schemes
Time independent first order perturbation theory non degenerate
and degenerate levels. Second order corrections for non degenerate levels.
Rayleigh Ritz Variation method. WKB apprximation.
Tutorial, Quiz, Test and Examination Papers
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