Atomic Physics and Basic Quantum Theory

Theory of Atom and Quantum Theory

Created byShyamal Mukherjee

Last updated 3/2025

English

What you'll learn

Bohr's atomic theory was successful for explanation of occurrence atomic line spectrum and the theory was extremely semi classical theory as given by Bohr.
Heisenberg uncertainty principle was the actual authentication of quantum theory as built up by a few basic postulates regarding normalization, expectation .etc
Schrodinger's quantum mechanics is the platform of probability conservation and is developed by replacing the particle by plane wave function given by Max Born.
The fine structure of atomic spectral line was explained by relativistic Reset model over Sommerfeld's atomic model by relativistic mass variation with velocity

Course content

1 section • 24 lectures • 6h 3m total length

Introduction3:14
1. Bohr Atom Model with Correction35:14
2. Bohr's Correspondence Principle13:48
3. Discovery of Deuteron from Bohr Theory7:26
4. Orbital Structure in Sommerfeld's Atomic Model21:43
5. Magnetic moment of Atom15:26
6. Normal Zeeman Effect10:16
7. Paschen Back Effect in Atomic Spectral Line13:09
8. Doublet Splitting of Sodium D line13:31
9. Compton Effect19:48
10. Wave Particle Duality33:16
11. Heisenberg's Uncertainty from Wave Particle Duality22:29
12. Heisenberg's Thought Experiment12:42
13. Non Existence of Electron within Nucleus4:24
14. Uncertainty Principle to Double Slit Experiment12:33
15. 1st and 2nd Postulates in Quantum Mechanics18:16
16. 3rd Postulate(Expansion Postulate) in Quantum Mechanics13:22
17. Schrodinger's Equation18:02
18. Equation of Continuity in Quantum Mechanics9:22
19. Stationary State in Quantum Mechanics9:48
20. Commotator Bracket9:27
21. Hermitian Operator10:30
22. Expectation Value of Quantum Operator9:46
23. Plank's Theory of Black Body Radiation26:19

Requirements

All the students in beginning and advance level should require this content.

Description

In this content, we first discuss Bohr's semi-classical theory of atomic structure with correction for finite nuclear mass. After that, the theory was supported by Bohr's corresponding principle. This successful theory of Bohr was then applied in several cases as the explanation of atomic line spectrum, the discovery of the neutron, ... etc. Lastly, the theory is extended to Sommerfeld's modification for explanation of fine structure of atomic spectra.

Along with this discussion of atomic structure, we also studied about the occurrence of magnetic moment of the atom and the effect of external magnetic field on it regarding the splitting of atomic spectral line. In this context, we discuss Normal Zeeman effect for strong field interaction and Paschen Back effect for intermediate field interaction.

At the beginning of the discussion of Basic quantum theory, we focus on Heisenberg's uncertainty principle through the detailed discussion of wave particle duality. This principle was also supported by Heisenberg's thought experiment. This uncertainty principle is then applied for an explanation of the non-existence of an electron within a nucleus.

After that, the basic postulates of New quantum mechanics are discussed here before the development of Schrodinger's new quantum mechanics or wave mechanics. This Schrodinger equation was then applied in the equation of continuity in quantum mechanics and for an explanation of the stationary state.

Apart from this, the basic idea about commutator bracket, expectation value ... etc. are discussed here. Finally, in this content we discuss Compton scattering, quantum theory of black body radiation ... etc.

The students at the beginner's as well as in advanced level must collect this content to have the knowledge about the basic atomic features and the basic quantum theory

Who this course is for:

Students at all level should accept this.