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This project includes:

• Interactive examples to calculate infrared spectra of molecules withRADIS, a convenient way to have access to HITRAN online without any installation.
• Static examples of fitting algorithm built aroundRADIS

A full online environment for advanced spectrum processing and comparison with experimental data

Start onradis.github.io/radis-lab/

Run RADIS interactively directly from the browser. No installation needed!

Manipulate aSpectrum object:

Calculate CO equilibrium and nonequilibrium spectra:

Import experimental spectra in an online JupyterLab instance and start fitting them!

Start a bare RADIS online session:

Install RADISthen run these examples locally.

A 3 temperature fitting example reproducing the validation case of Klarenaar 2017[1], who calculated a transmittancespectrum from the initial data of Dang 1973[2], with a 1 rotational temperature +3 vibrational temperature (Treanor distributions) model

CO2 Energies are calculated from Dunham developments in an uncoupled harmonicoscillator - rigid rotor model. The example is based on one ofRADIS validation cases.It makes use of the RADISSpectrumclass and the associated compare and load functions

Code is available in thefit_klarenaar_validation_case.py file

An example where we use RADIS to calculate the upward-radiation of the Earth for different CO2 mole fractionsin the atmosphere, based on the simple Standard Atmosphere Model. The difference evidences the radiativeforcing of CO2.

Code is available in theradiative_forcing_co2.py file

The absorption coefficient of all HITRAN species is calculated inplot_all_hitran_spectra.py at 300 K, 1 atm for the first isotope.

For instance:

• Water (H2O) absorption coefficient at 300 K :

• Carbon dioxide (CO2) absorption coefficient at 300 K :

• Methane (CH4) absorption coefficient at 300 K :

All other species can be foundon the RADIS website

• RADIS Documentation:http://radis.readthedocs.io/
• RADIS Source files:https://github.com/radis/radis
• PyPi project:https://pypi.python.org/pypi/radis
• Test status:https://travis-ci.org/radis/radis
• Test coverage:https://codecov.io/gh/radis/radis