Example gallery¶

These examples show simple calculations and tasks that can be performed with the RADIS package. Run them locally or in 🔬 Radis-Lab.

Database handling¶

Download databases and plot spectroscopic constants with RADIS.

Partition Functions from spectroscopic constants

Partition Functions from TIPS

Calculate Rovibrational Energies

Get Molecular Parameters

Use Custom Abundances

Explore Line Database Parameters

Download the HITRAN database

Plot HITRAN cross-sections

Line Survey

Scale Linestrengths of carbon-monoxide

Calculate and handle spectra¶

Computation of spectra, with redundancy of some modules in the examples. Benchmark of the RADIS code can also be found in \radis\test\benchmark.

Compare NO cross-sections from GEISA and ExoMol

Blackbody radiation

Atomic spectrum #0: Calculate an atomic spectrum

Atomic spectrum #1: Atomic partition functions

Atomic spectrum #2: Custom broadening function

Performance increase of broadening_methods and LDM optimizations.

Calculate a spectrum from ExoMol

Calculate a full range spectrum

HDF5 Spectrum Handling

Calculate a large spectrum by part

Calculate and Compare Spectra for Multiple Molecules

Calculate non-LTE spectra of carbon-monoxide

See populations of computed levels

Fitting experimental spectra (basics)¶

Useful functions to upload experimental data and fit them with simple models.

Chain Editing and Lineshape Fitting a Spectrum

Load an experimental spectrum

Fit Multiple Voigt Lineshapes

Remove a baseline

Post-process using Specutils

Fitting experimental spectra (advanced)¶

A wrapper is implemented in RADIS to fit experimental spectra with simulated spectra. We recommend starting with examples #1, #2, and #3. A legacy method is also available.

Example #1: Temperature fit

Example #2: multiparameters (T, x_CO, offset)

Example #3: non-equilibrium spectrum (Tvib, Trot, x_CO)

Legacy #1: Temperature fit of CO2 spectrum

Legacy #2: non-equilibrium CO2 (Tvib_12, Tvib_3, Trot)

Legacy vs recommended fitting examples

Example #7: Database fitting using SpecDatabase.fit_spectrum

GPU calculations¶

Unleash the power of your GPU to speed up your calculations.

GPU Accelerated Spectra

GPU Accelerated Spectra (recalc_gpu() demo)

Real-time GPU Accelerated Spectra (Interactive)

MatLab interface¶

RADIS can be accessed from Matlab by setting up Python environment in Matlab

s = py.radis.calc_spectrum(1900,2300,molecule='CO',isotope='1,2,3',pressure=1.01325,Tgas=700,mole_fraction=0.1,path_length=1,databank='hitran');
s.apply_slit(0.5,'nm');
s.plot(show=true);