Atomic Molecular Physics Rajkumar Pdf [portable] May 2026
The textbook Atomic and Molecular Physics (also commonly referred to as "Atomic and Molecular Spectra: Laser"
1. Introduction
Molecular Symmetry
: Introduces group theory and symmetry properties of rotational levels. Atomic Molecular Physics Rajkumar Pdf
- Hydrogenic atoms: radial equation, energy levels, degeneracies, Laguerre polynomials.
- Angular momentum & spin: commutation relations, ladder operators, addition of angular momentum, Clebsch–Gordan coefficients.
- Approximation methods: perturbation theory (time-independent and degenerate), variational method, WKB (qualitative).
- Atomic spectra: term symbols, LS and jj coupling, fine structure, hyperfine structure, Zeeman and Stark effects.
- Molecular electronic structure: Born–Oppenheimer approximation, molecular orbitals, valence bond vs. MO theory, symmetry and group theory basics.
- Molecular vibrations & rotations: rigid rotor, harmonic oscillator, anharmonicity, rotational–vibrational coupling, selection rules.
- Spectroscopy techniques: absorption/emission, rotational/vibrational spectroscopy fundamentals, Raman scattering basics.
- Collision and scattering basics: cross sections, partial waves, phase shifts (introductory level).
Multi-electron Systems
: Analysis of alkali and alkaline-earth elements, including L-S and j-j coupling schemes. The textbook Atomic and Molecular Physics (also commonly
Molecular Dynamics:
The text explains how chemical bonds (ionic, covalent, and metallic) form and how molecular vibrations and rotations are analyzed through infrared and microwave spectroscopy . including state-level BSc/MSc courses
"Atomic and Molecular Spectra: Laser" by Dr. Rajkumar
The textbook (published by Kedar Nath Ram Nath) is a definitive academic resource for undergraduate and postgraduate students in India and neighboring regions. It is widely recommended for university curricula, including state-level BSc/MSc courses, and is highly sought after by students preparing for competitive national examinations like CSIR-NET, GATE, and IIT-JAM.
Vector Atom Model
: Discussion of electron spin, magnetic dipole moments, and the Stern-Gerlach experiment.
Fine Structure
: Insights into spin-orbit interaction and the Pauli Exclusion Principle.