Hello friends welcome once again on our blog. I’m back with a new topic on Atomic Physics that is Effect of Nuclear motion on Spectra of Hydrogen like Atom. In my last post I’ve discussed Shortcomings of Bohr’s theory.
|Fig 1.Arrangement of Nucleus & electron|
Don’t Have Time to Read this post? Download this pdf file
Let “x” be the distance of nucleusfrom common centre of nass, then the distance of electron will be (r-x). At equilibrium the movement of “Mh” and “m” about “C” will be equal. Total angular momentum :
Momentum of atom about the centre of mass:
Taking nuclear motion into account ,Bohr’s first postulate that electron revolves around only those orbits whose angular momentum is nh/2π.
This shows that the Rydberg constant for hydrogen “Rh” depends upon the mass “Mh” of hydrogen nucleus. Thus, it is a constant only for a particular atom and varies slightly from atom to atom.
Related Posts :
- Thomson Model of Atom & It’s Drawbacks
- Scattering of alpha-particles :Rutherford model of atom
- Bohr’s model of Atom
- Bohr’s Theory of Hydrogen Spectrum
- Spectral Lines of Hydrogen atom
- What are Atomic Energy Levels?
- de-Broglie Model of Atom & Bohr’s Quantum Condition
- Excitation & Ionisation of Atoms & Molecules
- SHORTCOMINGS OF BOHR’S THEORY
- Discovery of Heavy Hydrogen
- Bohr’s Correspondence Principle
- Quantum Numbers of an electron in an atom
- Pauli’s Exclusion Principle
- Larmor Precession : Behavior of magnetic Dipole in External magnetic field
- Space Quantisation of an Atom
- Electron Spin -Atomic Physics
- Fine Structure of Alkali Spectra & it’s Explanation
- Sommerfeld Extension of Bohr’s Theory
- Vector Model of Atom; Coupling of Orbital & Spin Angular Momentum
- Noramal & Anamolous Zeeman Effect
- Expalaination of Normal Zeeman Effect & Zeeman Shift
- Expalaination of Anamolous Zeeman effect
- Zeeman Splitting of D1 and D2 lines
- j-j Coupling -Atomic Physics
- L-S Coupling (Russell-Saunders Coupling)