Genesis of Quantum Mechanics.- Heisenberg's Matrix Mechanics.- Schr?dinger's Wave Mechanics.- Lagrangian Formalism.- Wave Particle Duality.- The Eigenvalue Problem.- Atom Radiation.- Scattering of Light and Particles.- Atom in Magnetic Field.- Electron Spin and Pauli Equation.- Relativistic Quantum Mechanics.- Electrodynamics and Special Relativity.- Mathematical Appendices.- Exercises.- Index.