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Introduction; Bohr-Sommerfeld Theory of Hydrogen Atom; Quantum Mechanics of Hydrogen Atom : Angular Momentum and Parity; Magnetic Dipole Moments, Electron Spin and Vector Atom Model; Spin-Orbit Interaction : Hydrogen Fine Structure; Indentical Particles : Pauli's Exclusion Principle; Helium Atom and its Spectrum; Multi-electron Atoms : Hartree;s Field : Atomic Ground States and Periodic Table; Spectroscopic Terms : L-S and j-j Couplings; Spectra of Alkali Elements; Spectra of Alkaline-Earth Elements and Complex Spectra; Zeeman effect and Paschen-Back Effect; The Stark Effect; Hyperfine Structure of Spectral Lines; The Breadth of Spectral Lines; X-ray Spectra; Types of Molecular Spectra and Molecular Energy States; Pure Rotational Spectra; Vibrational Rotational Spectra; The Raman Spectra; Electronic Spectra : Franck-Condon Principle; Isotope Effect on Electronic Spectra; Fluorescence and Phosphorescence; Classification of Molecular Electronic States; Symmetry Properties of Rotational Levels: Nuclear Spin and Intensity Alternation; Coupling of Rotational and Electronic Motions : Types of Electronic Transitions; Co-relation between Atomic and Molecular States : Building-Up Principle; Molecules and Chemical Bonds : The Stability of Molecular States; Continuous and Diffuse Molecular Spectra : Dissociation and Predissociation; Temporal and Spatial Coherences; Laser :Einstein's Coefficients and Light Amplification; Types of Lasers : Characteristics and Applications of Lasers