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According to Wikipedia "Atomic physics (or atom physics) is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. This includes ions as well as neutral atoms and, unless otherwise stated, for the purposes of this discussion it should be assumed that the term atom includes ions."

**Atomic physics** is considered in the reference of atomic, molecular, nuclear and optical physics. But due to its name it is also concerned with nuclear power and nuclear bombs, but it is a broad area which encircles the field of nucleus and electrons and their mechanism.

Atomic physics is not related with the formation of molecules. It is used to know the process of excitation and ionization by collisions of photons or atomic particles. Atomic physics is a discipline of physics and is used with various branches of science and engineering to study the nuclear structures and its foundation. Main scientists of Atomic theory are John Dalton, Joseph von Fraunhofer, Johannes Rydberg, J.J. Thomson, Alexander Dalgarno, David Bates, Niels Bohr, Max Born, Clinton Joseph Davisson, Enrico Fermi, Charlotte Froese Fischer, Vladimir Fock, Douglas Hartree, Harrie S. Massey, Nevill Mott, Mike Seaton, John C. Slater and George Paget Thomson.. It was developed by the **British physicist John Dalton in 18th century** who studies it to know the basic unit of a chemical but later it became a part of quantum mechanics and now it is a separate stream of physics. Presently it is used in various branches of science such as chemistry, quantum chemistry, sprectroscopy, quantum mechanics, engineering, nuclear physics, etc.

Atomic physics covers almost each and every aspect of atoms including various topics of physics. Some of them are— The Bohr model of atom, numerical values, dimensions and localizing the electron, classical radius of electron, Atomic units, Angular Momentum and lowering operations including commutation relations with vector operators. Matrix elements of Vector operators, Eigenfunctions of orbital angular momentum operators, Vector model of angular momentum, examples of calculation of the Clebsch-Gordan coefficients, two sets of quantum numbers - uncoupled and coupled, Hyperfine splitting in the hydrogen atom, the accidental degeneracy of the hydrogen atom, nature of spherical eigenfunctions, Separation of the Schrödinger equation in parabolic coordinates, Solution of the separated equations in parabolic coordinates - the energy eigenvalues and eigenfunctions, The Lenz Vector and the Accidental Degeneracy and the Lenz vector in quantum mechanics, Energy eigenvalues, relations between the parabolic quantum numbers, spherical and parabolic eigenfunctions, relativistic correction for the electronic kinetic energy, the Lamb shift, the solution of the Dirac equation, the Zeeman effect – the hydrogen atom in a constant magnetic field, Weak electric field - the quantum mechanical Stark effect, Weak electric field - the classical Stark effect.- the Helium Atom: Indistinguishable particles, the total energy of the helium atom, The designation of states - LS coupling and jj coupling, Quantum defect and evaluation of the quantum defect, Stimulated absorption and stimulated emission, Spontaneous emission, transitions in multi-electron atoms.

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