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Atomic & Molecular Physics
Free PDF Notes — CSIR NET · IIT JAM · GATE
10 complete chapters covering the full Atomic and Molecular Physics syllabus — Bohr-Sommerfeld Theory, Fine Structure, Zeeman and Stark Effects, Molecular Spectra, X-ray Spectra, and Lasers. 46 chapter slots, 3 PDFs live now. 100% free, no login required.
3 PDFs available now — Chapter 1 (Bohr-Sommerfeld Theory) is fully uploaded. All remaining chapters are being added progressively. Bookmark this page, or register for a free demo class to access complete study material immediately.
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Chapter 1: Bohr-Sommerfeld Theory and Hydrogen Atom
3 PDFs ✓Bohr-Sommerfeld quantization, Bohr quantization rule for the hydrogen atom, energy levels and spectra, Sommerfeld extension of the Bohr model incorporating elliptical orbits and relativistic corrections. Foundation of atomic physics for all competitive exams.
Chapter 2: Vector Atom Model and Quantum Numbers
0/4 AvailableVector atom model, orbital, spin and total angular momentum quantum numbers (l, s, j), space quantization, magnetic quantum number, Lande g-factor, selection rules for optical transitions.
Chapter 3: Fine Structure and Spin-Orbit Coupling
0/5 AvailableElectron spin, spin-orbit interaction, fine structure of hydrogen, relativistic correction, Darwin term, Lamb shift, fine structure constant. Critical topic in CSIR NET Part C.
Chapter 4: Many-Electron Atoms and Coupling Schemes
0/5 AvailablePauli exclusion principle, periodic table structure, LS (Russell-Saunders) coupling, jj coupling, spectroscopic terms and notation (2S+1)LJ, Hund’s rules, multi-electron configurations.
Chapter 5: Atoms in External Fields
0/5 AvailableNormal and anomalous Zeeman effect, Paschen-Back effect, Stark effect (linear and quadratic), polarizability, and hyperfine structure due to nuclear spin. High-weightage in CSIR NET.
Chapter 6: Spectra of Alkali Metals and Helium
0/4 AvailableAlkali metal spectra (doublet structure), quantum defect, Rydberg series, helium atom (ortho and para helium), exchange interaction, singlet and triplet states, helium spectra.
Chapter 7: X-ray Spectra
0/3 AvailableCharacteristic X-rays, Moseley’s law, X-ray absorption edges, Auger effect, and X-ray emission spectra. Important topic for CSIR NET and IIT JAM Atomic Physics sections.
Chapter 8: Molecular Structure and Born-Oppenheimer
0/5 AvailableBorn-Oppenheimer approximation, molecular orbitals, LCAO method, bonding and antibonding orbitals, H2+ and H2 molecules, valence bond theory, molecular symmetry and point groups.
Chapter 9: Molecular Spectra
0/7 AvailableRotational spectra (rigid rotor, centrifugal distortion), vibrational spectra (harmonic and anharmonic oscillator, Morse potential), rotation-vibration spectra, Raman spectra, Frank-Condon principle.
Chapter 10: Lasers and Coherent Light
0/5 AvailableStimulated emission, population inversion, Einstein A and B coefficients, three-level and four-level laser systems, laser rate equations, common lasers (Ruby, He-Ne, CO2, semiconductor lasers), laser applications.
Atomic and Molecular Physics for CSIR NET, IIT JAM and GATE
Atomic and Molecular Physics is a consistently high-scoring topic in CSIR NET Physical Sciences, featuring regularly in Part B and Part C with problems on fine structure, Zeeman effect, LS coupling, Raman spectra, and lasers. In IIT JAM Physics, Atomic Physics contributes through the Modern Physics section, with questions on the Bohr model, X-ray spectra, and atomic energy levels. For GATE Physics, Atomic and Molecular Physics is a dedicated section covering spectra, coupling schemes, and molecular energy levels. For JEST and TIFR, advanced atomic physics including hyperfine structure and laser physics are tested.
Pravegaa Education’s free Atomic and Molecular Physics PDFs are organized across 10 chapters, progressing logically from the Bohr-Sommerfeld model through modern atomic theory, molecular structure, molecular spectra, and laser physics. Chapter 1 is fully available; remaining chapters are being uploaded progressively.
High-Priority Chapters for CSIR NET
- Chapter 5 — Zeeman and Stark Effects: Normal and anomalous Zeeman effect, Paschen-Back effect, and Stark effect problems appear in almost every CSIR NET paper.
- Chapter 4 — LS and jj Coupling: Spectroscopic terms, Hund’s rules, and term symbols are tested in CSIR NET Part B and C.
- Chapter 9 — Molecular Spectra: Rotational and vibrational spectra, Raman spectra, and the Franck-Condon principle are high-value CSIR NET topics.
- Chapter 3 — Fine Structure: Spin-orbit coupling, Lamb shift, and fine structure of hydrogen appear in CSIR NET Part C.
High-Priority Chapters for IIT JAM Physics
- Chapter 1 — Bohr-Sommerfeld Theory: Bohr model, energy levels, and hydrogen spectra are core IIT JAM atomic physics topics.
- Chapter 7 — X-ray Spectra: Moseley’s law and characteristic X-rays appear in IIT JAM Modern Physics section.
- Chapter 5 — Zeeman Effect: Normal Zeeman effect and its applications are regularly tested in IIT JAM.
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Pravegaa Education is a physics-only coaching institute at 28B/7, Jia Sarai, Near IIT Delhi, New Delhi founded by Atul Gaurav (JNU alumnus) and Dr. Alok Shukla (IIT Delhi alumnus). With 8,000+ selections and AIR 1 results, Pravegaa is India’s most focused institute for CSIR NET Physics and IIT JAM Physics. Book a free demo class or call 8920759559.
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