Atomic Molecular Physics Rajkumar Pdf -

Atomic and Molecular Physics by Raj Kumar (often titled Atomic & Molecular Spectra: Laser

Spectroscopy and Transitions

• Atomic spectra: Discrete lines from electronic transitions; fine structure (spin–orbit coupling) and hyperfine structure (nuclear spin interactions) further split levels.
• Molecular spectra: Electronic, vibrational (infrared), and rotational (microwave) bands; rovibrational structure arises from coupling between vibrations and rotations.
• Spectroscopic techniques: Absorption, emission, fluorescence, Raman, photoelectron spectroscopy, and laser-based methods provide precise measurements of energy levels, lifetimes, and dynamics.
• Line broadening: Natural, Doppler, collisional (pressure), and instrumental broadening affect observed spectra.

Rajkumar’s treatment of low‑energy scattering introduces the effective‑range expansion, which remains the standard pedagogical tool. Recent literature (e.g., J. Phys. B 2023) expands this to multichannel quantum defect theory (MQDT) for heteronuclear polar molecules. Atomic Molecular Physics Rajkumar Pdf

1. Scope and learning goals

• Core topics: atomic structure, quantum mechanics basics, spectra of atoms, molecular structure and bonding, molecular spectra (rotational, vibrational, electronic), molecular quantum mechanics, scattering, and basic spectroscopy techniques.
• Skills to gain: solve Schrödinger-equation problems for simple systems, analyze spectral lines, predict molecular energy levels and transitions, use selection rules, perform order-of-magnitude estimates for spectroscopic constants, and apply perturbation methods.