🎓 Spectroscopy 101 with RADIS

🎓 Spectroscopy 101 with RADIS

Building the tutorial

Content

First tutorials in https://github.com/radis/spectro101

Content Ideas

Discovering spectroscopy :

• "Blue is Hotter than Red" : Wien's Law in blackbody radiation.
• "Is Blue Always Hotter than Red" ? The case of the CH lines in a (blue) flame : discrete spectral content, and beyond the Planck's law.
• "If you point a spectrometer to the sun do you see Hydrogen ?" Lineshape broadening, saturation, and connecting spectrometer and Planck's law.

Historical :

• "The Ultraviolet catastrophe" : deriving Planck's law

The physics behind :

• "Non harmonics" : rotational and vibrational energies in molecules
• "Look at the bandhead" : exploring P, Q, R branches. CO is a good example, with transition from low temperature almost symmetric rotational spectra to to high temperature bandheads.
• "Measure a temperature from afar" : fitting spectra in molecules

Radiative transfer :

• Radiative Transfer Equation : analytical solution to a homogeneous column.
• "Not everything is black or white" : self-absorption, optically thin and grey-bodies.

Advanced :

• lineshapes : Lorentzian theory, line mixing, continuum
• relationship between Linestrengths, Einstein coefficients
• C-k models
• "More than one temperature ?" Discovering nonequilibrium and non-Boltzmann distributions

Atmosphere science :

• "Radiative forcing" : atmospheric spectra, radiative forcing and the different temperatures isolines. Ex with a CO2 model and building the spectrum as altitude increases
• "Are CO2 lines saturated ?" : an answer using RADIS to a common pitfall among climate skeptics

Ressources

Physics

• HITRAN 1996 Appendix for most equations
• Herzberg II, Infrared and Raman Spectra of Diatomic Molecules
• Hanson, Optical Diagnostics etc.
• Advanced : Collisional Effects on Molecular Spectra, Hartmann et al , 1st and 2nd edition

Tutorial

• use RADIS-Lab for demos ?

Inspiration

• astropy tutorials (more focused on the code, though)