Spontaneous and Stimulated Emission of Radiation (Lecture – 02) by Professor G Srinivasan

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International Centre for Theoretical Sciences
Published at : 23 Nov 2020
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Summer course 2018 - A Random walk in astro-physics

Lecture - 02 : Spontaneous and Stimulated Emission of Radiation
by Professor G Srinivasan, Raman Research Institute (Retired)

10.00 to 12.00 Friday, 18 May 2018
Madhava Lecture Hall, ICTS Bangalore

The range of densities, temperatures, magnetic fields, etc. that obtain in the Universe are staggering: from 10-27 g cm-3 to 1015 g cm-3, from 3K to 1010 K, from 10-6 G to 1015 G. Not surprisingly, the variety of physical phenomena one encounters during the study of celestial objects is truly impressive. This set of lectures is intended to illustrate the richness of Astrophysics. It will be a random walk in basic physics, with numerous illustrations from astronomy. The topics in physics that will be reviewed have been chosen on the basis of their importance in contemporary astronomy.

Topics:

Absorption and emission of radiation
Radiation from relativistic electrons
Compton scattering of radiation
Spontaneous and stimulated emission
Hyperfine splitting of energy levels
Molecular spectra
Astrophysical plasma.
Quantum tunnelling.
Nuclear matter
Neutrino Oscillation
Phase transitions and the early Universe
During this random walk in physics, one will encounter a range of astronomical objects and phenomena, such as, Solar wind, gaseous nebulae, interstellar hydrogen clouds, giant molecular clouds, neutron stars and pulsars, supernova remnants, radio galaxies and quasars, active galactic nuclei, the cosmic microwave background, etc.

https://www.icts.res.in/summercourse2018

Table of Contents (powered by https://videoken.com)
0:00:00 Summer course 2018 - A Random walk in astro-physics
0:00:10 Spontaneous and Stimulated Emission of Radiation (Lecture - 02)
0:00:46 Quantum theory of radiation
0:01:14 The opening sentence of Einstein's 1917 paper:
0:10:03 But Einstein wanted his quantum theory to give Planck's Law!
0:18:34 Einstein's profound insight in 1917:
0:20:51 Definition of the Einstein coefficients in Quantum Mechanics
0:22:25 Spontaneous Emission
0:24:27 Stimulated emission
0:28:43 Absorption and Emission coefficients in terms of the Einstein Coefficients.
0:32:06 Absorption coefficient alpha
0:34:28 It is useful to regard stimulated emission as negative absorption .
0:39:17 Inverted population
0:43:49 Two-state systems in Quantum Mechanics
0:45:58 Zeeman splitting of energy levels
0:50:11 Hyperfine splitting of energy levels
0:50:32 Fine structure of energy levels of electron in atoms
0:54:25 Hyperfine Splitting
0:58:44 Hyperfine splitting of ground state of hydrogen atom (Enrico Fermi, 1930)
1:02:32 After some standard steps,
1:05:46 Radial wave function of Is electron in a hydrogen atom
1:06:46 Hyperfine splitting of n=1 level of hydrogen atom
1:13:25 Ammonia molecule
1:23:32 Electric dipole moment of Ammonia molecule
1:25:49 Two-state systems in Quantum Mechanics
1:29:31 Maser
1:33:26 Ammonia Maser
1:33:55 Hydrogen Maser
1:34:12 The Nobel Prize in Physics 1964
1:34:30 3-level laser
1:35:44 Celestial Masers
1:37:40 Next Lecture - The Interstellar Medium
1:38:10 Q&A
SpontaneousStimulatedEmission

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