Contents * Chapter One : Breakdown of Classical Physics * Chapter Two : Schrodinger Wave Equation * Chapter Three : Commutation Relations, Wave Packets and Uncertainty Principle * Chapter Four : Operators, Eigenfunctions and Eigenvalues * Chapter Five : Hamiltonian and Path Integral Methods of Quantisation * Chapter Six : One Dimensional Problems * Chapter Seven : Energy Bands and Harmonic Oscillator * Chapter Eight : Spherically Symmetric Potentials * Chapter Nine : Elementary Theory of Angular Momentum * Chapter Ten : Matrix Formulation of Quantum Mechanics * Chapter Eleven : Approximation Methods : The WKB Approximation * Chapter Twelve : Time Independent Perturbation Theory * Chapter Thirteen : The Variation Method * Chapter Fourteen : Time Dependent Perturbation Theory * Chapter Fifteen : Indentical Particles * Chapter Sixteen : Many - Electron Atoms * Chapter Seventeen : Theory of Simple Molecues * Chapter Eighteen : Elementary Scattering Theory * Chapter Nineteen : The Dirac Eouation * Chapter Twenty : Density Matrix : Bell's Inequality * Chapter Twenty One : Problems of Interprotation of Quantum Mechanics