radis

A fast line-by-line code for high-resolution infrared molecular spectra.
https://github.com/radis/radis

Category: Atmosphere
Sub Category: Radiative Transfer

Keywords

astrophysics closember combustion exoplanets hitemp hitran infrared plasma plasma-physics radiation spectra spectroscopy

Keywords from Contributors

line-by-line

Last synced: about 23 hours ago
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Repository metadata

🌱 A fast line-by-line code for high-resolution infrared molecular spectra

• Host: GitHub
• URL: https://github.com/radis/radis
• Owner: radis
• License: lgpl-3.0
• Created: 2018-01-25T15:54:18.000Z (almost 8 years ago)
• Default Branch: develop
• Last Pushed: 2025-10-19T14:06:45.000Z (2 months ago)
• Last Synced: 2025-10-23T16:44:50.305Z (2 months ago)
• Topics: astrophysics, closember, combustion, exoplanets, hitemp, hitran, infrared, plasma, plasma-physics, radiation, spectra, spectroscopy
• Language: Python
• Homepage: http://radis.github.io/
• Size: 37.9 MB
• Stars: 250
• Watchers: 10
• Forks: 153
• Open Issues: 91
• Releases: 28
• Metadata Files:
  • Readme: README.rst
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

README.rst

           | |badge_pypi|  |badge_pypistats| |badge_article1| |badge_article2| |badge_docs| |badge_binder|
 | |badge_slack| |badge_contributors| |badge_travis| |badge_coverage| |badge_code_quality| |badge_asv| |badge_license|

*****************************************
`RADIS `__
*****************************************

RADIS is a fast line-by-line code for high resolution infrared molecular spectra (emission / absorption,
equilibrium / non-LTE) based on HITRAN/HITEMP/ExoMol.
Atomic spectra from the NIST and Kurucz databases are also available.

RADIS includes post-processing tools to compare experimental spectra and spectra calculated
with RADIS or other spectral codes.

Full user documentation (advanced install and examples) are available on the `RADIS Website `__.

===============
Getting Started
===============

Install
-------

Assuming you have Python installed with the `Anaconda `_ distribution you can use ``pip``::

    pip install radis

or ``mamba`` or ``conda`` via the conda-forge channel::

    conda install radis -c conda-forge

**That's it!** You can now run your first example below.
If you encounter any issue, or to upgrade the package later, please refer to the
`detailed installation procedure `__ .

Quick Start
-----------

Calculate a CO equilibrium spectrum from the HITRAN database ::

    from radis import calc_spectrum
    s = calc_spectrum(1900, 2300,         # cm-1
                      molecule='CO',
                      isotope='1,2,3',
                      pressure=1.01325,   # bar
                      Tgas=700,           # K
                      mole_fraction=0.1,
                      path_length=1,      # cm
                      databank='hitran'   # or 'hitemp'
                      )
    s.apply_slit(0.5, 'nm')       # simulate an experimental slit
    s.plot('radiance')

.. figure:: https://radis.readthedocs.io/en/latest/_images/co_spectrum_700K.png
    :scale: 60 %


Advanced use
------------

The Quick Start examples automatically downloads the line databases from `HITRAN-2016 `__, which is valid for temperatures below 700 K.
For *high temperature* cases, you may need to use other line databases such as
`HITEMP-2010 `__ (typically T < 2000 K) or `CDSD-4000 `__ (T < 5000 K). HITEMP can also be downloaded
automatically, or can be downloaded manually and described in a ``~/radis.json``
`Configuration file `__.

More complex `examples `__ will require to use the `SpectrumFactory `__
class, which is the core of RADIS line-by-line calculations.
`calc_spectrum `__ is a wrapper to `SpectrumFactory `__
for the simple cases.

Compare with experiments
------------------------

Experimental spectra can be loaded using the `experimental_spectrum `__ function
and compared with the `plot_diff `__ function. For instance::

    from numpy import loadtxt
    from radis import experimental_spectrum, plot_diff
    w, I = loadtxt('my_file.txt').T    # assuming 2 columns
    sexp = experimental_spectrum(w, I, Iunit='mW/cm2/sr/nm')
    plot_diff(sexp, s)    # comparing with spectrum 's' calculated previously

Typical output of `plot_diff `__:

.. image:: docs/spectrum/cdsd4000_vs_hitemp_3409K.svg
    :scale: 60 %
    :target: https://radis.readthedocs.io/en/latest/spectrum/spectrum.html#compare-two-spectra
    :alt: https://radis.readthedocs.io/en/latest/_images/cdsd4000_vs_hitemp_3409K.svg

Refer to the `Examples `__ section for more examples, and to the
`Spectrum page `__ for more post-processing functions.


GPU Acceleration
----------------

RADIS supports GPU acceleration for super-fast computation of spectra. Refer to `GPU Spectrum Calculation on RADIS `__ for more details on GPU acceleration.::

=======================================
Try online (no installation needed!)
=======================================

🌱 Radis-app
---------

A simple `web-app `__ for RADIS under development - `GitHub `__

.. image:: https://user-images.githubusercontent.com/16088743/103406077-b2457100-4b59-11eb-82c0-e4de027a91c4.png
    :target: https://radis.app/
    :alt: https://radis.app/


🔬 RADIS-lab
---------

An `online environment `__ for advanced spectrum processing and comparison with experimental data:

- no need to install anything
- use pre-configured line databases (HITEMP)
- upload your data files, download your results !


.. image:: https://user-images.githubusercontent.com/16088743/103448773-7d8f0200-4c9e-11eb-8bf1-ce3385519b77.png
    :target: https://radis.github.io/radis-lab/
    :alt: https://radis.github.io/radis-lab/

See more `on GitHub `__


---------------------------------------------------------------------

====
Cite
====

Articles are available at |badge_article1| |badge_article2|

For reproducibility, do not forget to cite the line database used, and the spectroscopic constants
if running nonequilibrium  calculations. See `How to cite? `__

---------------------------------------------------------------------

===============
Developer Guide
===============

Contribute
----------

Want to contribute to RADIS? Join the Slack community and we'll help you through the process.
Want to get started immediately? Nice. Have a look at the the `Developer Guide `__.

|badge_contributors| |badge_slack|

.. You need to know more about Spectroscopy ? We're working on Tutorials to
.. make spectroscopy available to everyone. For the moment, join the
.. `Slack channel `__ .


RADIS internals are also described in the `full documentation `__

.. .. image:: https://radis.readthedocs.io/en/latest/_images/RADIS_flow_chart.svg
..      :target:   https://radis.readthedocs.io/en/latest/dev/architecture.html#label-dev-architecture
..      :alt: https://radis.readthedocs.io/en/latest/_images/RADIS_flow_chart.svg


.. ### Matlab

.. Matlab users can seamlessly access Python modules

.. Here's what's you'll need:

.. 1. [Setup Python ↔ Matlab interface](https://www.scivision.dev/matlab-python-user-module-import/).
.. 2. Install RADIS in Python as at the top of this Readme.
.. 3. From Matlab, verify everything is working by:

..         ```
..         py.radis.calc_spectrum()
..         ```


License
-------

The code is available on this repository under
`GNU LESSER GENERAL PUBLIC LICENSE (v3) <./LICENSE>`_   |badge_license|


.. Support
.. -------

.. If encountering any problem, first refer to the list of known
.. `Issues `__ on GitHub.
.. We appreciate your feedback and suggestions!

.. For any question, please join the discussion channel on Gitter |badge_gitter|, Slack |badge_slack|
.. or the `Q&A Forum `__


.. Finally, you can also suggest or vote for new features below:

.. .. image:: https://feathub.com/radis/radis?format=svg
..    :target: https://feathub.com/radis/radis



---------------------------------------------------------------------

==========
References
==========

Links
-----

- Documentation: |badge_docs|

- Help: |badge_gitter| |badge_slack|  `Q&A forum `__

- Articles: |badge_article1| |badge_article2|

- Source Code: |badge_stars| |badge_contributors| |badge_license|

- Test Status: |badge_travis| |badge_coverage| |badge_asv|

- PyPi Repository: |badge_pypi|  |badge_pypistats|

- Interactive Examples: `radis_examples `__ |badge_examples| |badge_binder|

- `Fitroom `__ (for advanced multidimensional fitting).



Other Spectroscopic tools
-------------------------

See `awesome-spectra `__   |badge_awesome_spectra|

--------

.. image:: https://github.com/radis/radis/blob/master/docs/radis_ico.png
    :target: https://radis.readthedocs.io/
    :scale: 50 %
    :alt: RADIS logo





.. |CO2| replace:: CO\ :sub:`2`

.. |badge_docs| image:: https://readthedocs.org/projects/radis/badge/
                :target: https://readthedocs.org/projects/radis/
                :alt: Documentation Status

.. |badge_article1| image:: https://zenodo.org/badge/doi/10.1016/j.jqsrt.2018.09.027.svg
                   :target: https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867
                   :alt: Article

.. |badge_article2| image:: https://zenodo.org/badge/doi/10.1016/j.jqsrt.2020.107476.svg
                   :target: https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049
                   :alt: Spectral Synthesis Algorithm

.. |badge_stars| image:: https://img.shields.io/github/stars/radis/radis.svg?style=social&label=Star
                :target: https://github.com/radis/radis/stargazers
                :alt: GitHub

.. |badge_contributors| image:: https://img.shields.io/github/contributors/radis/radis.svg
                        :target: https://github.com/radis/radis/graphs/contributors
                        :alt: Contributors

.. |badge_license| image:: https://img.shields.io/badge/License-LGPL3-blue.svg
                   :target: ./License.md
                   :alt: License

.. |badge_travis| image:: https://app.travis-ci.com/radis/radis.svg?branch=develop
                  :target: https://app.travis-ci.com/github/radis/radis
                  :alt: Tests

.. |badge_coverage| image:: https://codecov.io/gh/radis/radis/branch/develop/graph/badge.svg
                    :target: https://codecov.io/gh/radis/radis
                    :alt: Coverage

.. |badge_code_quality| image:: https://img.shields.io/lgtm/grade/python/g/radis/radis.svg?logo=lgtm&logoWidth=18)
                  :target: https://lgtm.com/projects/g/radis/radis/alerts
                  :alt: Code Quality

.. |badge_asv| image:: http://img.shields.io/badge/benchmarked%20by-asv-blue.svg?style=flat
                  :target: https://github.com/radis/radis-benchmark
                  :alt: Benchmarks

.. |badge_pypi| image:: https://img.shields.io/pypi/v/radis.svg
                :target: https://pypi.python.org/pypi/radis
                :alt: PyPI

.. |badge_pypistats| image:: https://img.shields.io/pypi/dw/radis.svg
                     :target: https://pypistats.org/packages/radis
                     :alt: Downloads

.. |badge_examples| image:: https://img.shields.io/github/stars/radis/radis-examples.svg?style=social&label=Star
                :target: https://github.com/radis/radis-examples
                :alt: Examples

.. |badge_awesome_spectra| image:: https://img.shields.io/github/stars/erwanp/awesome-spectra.svg?style=social&label=Star
                           :target: https://github.com/erwanp/awesome-spectra
                           :alt: Examples

.. |badge_binder| image:: https://mybinder.org/badge.svg
                  :target: https://radis.github.io/radis-lab/
                  :alt: https://radis.github.io/radis-lab/

.. |badge_gitter| image:: https://badges.gitter.im/Join%20Chat.svg
                  :target: https://gitter.im/radis-radiation/community
                  :alt: Gitter

.. |badge_slack| image:: https://img.shields.io/badge/slack-join-green.svg?logo=slack
                  :target: https://radis.github.io/slack-invite/
                  :alt: Slack

        

---

Owner metadata

• Name: RADIS
• Login: radis
• Email: radis-radiation@googlegroups.com
• Kind: organization
• Description: Fast molecular spectra
• Website: https://radis.github.io/
• Location: https://radis.github.io/slack-invite/
• Twitter: radis_radiation
• Company:
• Icon url: https://avatars.githubusercontent.com/u/35809936?v=4
• Repositories: 20
• Last ynced at: 2025-09-26T05:46:52.898Z
• Profile URL: https://github.com/radis

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• Pull request review event: 238
• Pull request event: 165
• Fork event: 32

Last Year

• Create event: 26
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• Issues event: 96
• Watch event: 27
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• Issue comment event: 441
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• Pull request event: 165
• Fork event: 31

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Last synced: 2 months ago

Name	Email	Commits
Erwan Pannier	e****r@g****m	1516
NicolasEM2C	n****i@c****r	465
Dirk van den Bekerom	d****m@g****m	364
Josh Soref	2****f	175
anandxkumar	a****0@g****m	131
Darshan Patil	d****5@g****m	123
menasrac	r****a@s****r	72
Pankaj Mishra	p****1@g****m	66
Somesh	1****a@g****m	64
CorentinGrimaldi	c****i@p****m	62
Prtm2110	p****e@g****m	61
code29563	8****3	60
Hajime Kawahara	d****t@g****m	44
Tran Huu Nhat Huy	h****5@g****m	41
Supriya1702	s****i@g****m	39
gagan-aryan	g****9@g****m	31
mohyware	m****0@g****m	26
Sagar Chotalia	s****2@g****m	20
adityabharadwaj198	a****8@g****m	19
merintheres	m****e@g****m	19
Sonika	s****7@g****m	18
Susannah Klaneček	s****l@p****h	16
arunavabasu-03	a****v@g****m	12
Nicolas MINESI	n****i@e****r	12
Ritwik Saha	s****8@g****m	10
gh4ag	g****d@g****m	9
Ulysse	4****d	8
Alexander Johan Arntzen	a****n@g****m	6
Adarsh Desai	d****2@g****m	6
gugzy	a****e@e****r	5
and 28 more...

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