> | [](https://pypi.python.org/pypi/radis)
> [](https://pypistats.org/packages/radis)
> [](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)
> [](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)
> [](https://readthedocs.org/projects/radis/)
> [](https://radis.github.io/radis-lab/)
> | [](https://radis.github.io/slack-invite/)
> [](https://github.com/radis/radis/graphs/contributors)
> [](https://app.travis-ci.com/github/radis/radis)
> [](https://codecov.io/gh/radis/radis)
> [)](https://lgtm.com/projects/g/radis/radis/alerts)
> [](https://github.com/radis/radis-benchmark)
> [](./License.md)
[RADIS](https://radis.readthedocs.io/)
======================================
RADIS is a fast line-by-line code for high resolution infrared molecular
spectra (emission / absorption, equilibrium / non-LTE) based on
HITRAN/HITEMP/ExoMol.
It includes post-processing tools to compare experimental spectra and
spectra calculated with RADIS or other spectral codes.
User full documentation (advanced install and examples) are available on
the [RADIS Website](http://radis.readthedocs.io/).
Getting Started
---------------
### Install
Assuming you have Python installed with the
[Anaconda](https://www.anaconda.com/download/) 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](https://radis.readthedocs.io/en/latest/dev/developer.html#label-install)
.
### 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')
### Advanced use
The Quick Start examples automatically downloads the line databases from
[HITRAN-2016](https://radis.readthedocs.io/en/latest/references/references.html#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](https://radis.readthedocs.io/en/latest/references/references.html#hitemp-2010)
(typically T \< 2000 K) or
[CDSD-4000](https://radis.readthedocs.io/en/latest/references/references.html#cdsd-4000)
(T \< 5000 K). HITEMP can also be downloaded automatically, or can be
downloaded manually and described in a `~/radis.json` [Configuration
file](https://radis.readthedocs.io/en/latest/lbl/lbl.html#label-lbl-config-file).
More complex
[examples](https://radis.readthedocs.io/en/latest/examples.html#label-examples)
will require to use the
[SpectrumFactory](https://radis.readthedocs.io/en/latest/source/radis.lbl.factory.html#radis.lbl.factory.SpectrumFactory)
class, which is the core of RADIS line-by-line calculations.
[calc\_spectrum](https://radis.readthedocs.io/en/latest/source/radis.lbl.calc.html#radis.lbl.calc.calc_spectrum)
is a wrapper to
[SpectrumFactory](https://radis.readthedocs.io/en/latest/source/radis.lbl.factory.html#radis.lbl.factory.SpectrumFactory)
for the simple cases.
### Compare with experiments
Experimental spectra can be loaded using the
[experimental\_spectrum](https://radis.readthedocs.io/en/latest/source/radis.spectrum.models.html#radis.spectrum.models.experimental_spectrum)
function and compared with the
[plot\_diff](https://radis.readthedocs.io/en/latest/source/radis.spectrum.compare.html#radis.spectrum.compare.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](https://radis.readthedocs.io/en/latest/source/radis.spectrum.compare.html#radis.spectrum.compare.plot_diff):
[](https://radis.readthedocs.io/en/latest/spectrum/spectrum.html#compare-two-spectra)
Refer to the
[Examples](https://radis.readthedocs.io/en/latest/examples/examples.html)
section for more examples, and to the [Spectrum
page](https://radis.readthedocs.io/en/latest/spectrum/spectrum.html) for
more post-processing functions.
### GPU Acceleration
RADIS supports GPU acceleration for super-fast computation of spectra.
Refer to [GPU Spectrum Calculation on
RADIS](https://radis.readthedocs.io/en/latest/lbl/lbl.html#calculating-spectrum-using-gpu)
for more details on GPU acceleration.:
=======================================
#### Try online (no installation needed!)
🌱 Radis-app \-\-\-\-\-\-\-\--
A simple [web-app](https://radis.app/) for RADIS under development -
[GitHub](https://github.com/suzil/radis-app)
[](https://radis.app/)
🔬 RADIS-lab \-\-\-\-\-\-\-\--
An [online environment](https://github.com/radis/radis-lab) 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 !
[](https://radis.github.io/radis-lab/)
See more [on GitHub](https://github.com/radis/radis-lab)
------------------------------------------------------------------------
Cite
----
Articles are available at
[](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)
[](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)
For reproducibility, do not forget to cite the line database used, and
the spectroscopic constants if running nonequilibrium calculations. See
[How to
cite?](https://radis.readthedocs.io/en/latest/references/references.html#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 immediatly? Nice. Have a
look at the the [Developer
Guide](https://radis.readthedocs.io/en/latest/dev/developer.html).
[](https://github.com/radis/radis/graphs/contributors)
[](https://radis.github.io/slack-invite/)
RADIS internals are also described in the [full
documentation](https://radis.readthedocs.io/en/latest/index.html)
### License
The code is available on this repository under [GNU LESSER GENERAL
PUBLIC LICENSE (v3)](./LICENSE)
[](./License.md)
------------------------------------------------------------------------
References
----------
### Links
- Documentation:
[](https://readthedocs.org/projects/radis/)
- Help:
[](https://gitter.im/radis-radiation/community)
[](https://radis.github.io/slack-invite/)
[Q&A forum](https://groups.google.com/forum/#!forum/radis-radiation)
- Articles:
[](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)
[](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)
- Source Code:
[](https://github.com/radis/radis/stargazers)
[](https://github.com/radis/radis/graphs/contributors)
[](./License.md)
- Test Status:
[](https://app.travis-ci.com/github/radis/radis)
[](https://codecov.io/gh/radis/radis)
[](https://github.com/radis/radis-benchmark)
- PyPi Repository:
[](https://pypi.python.org/pypi/radis)
[](https://pypistats.org/packages/radis)
- Interactive Examples:
[radis\_examples](https://github.com/radis/radis-examples)
[](https://github.com/radis/radis-examples)
[](https://radis.github.io/radis-lab/)
- [Fitroom](https://github.com/radis/fitroom) (for advanced
multidimensional fitting).
### Other Spectroscopic tools
See [awesome-spectra](https://github.com/erwanp/awesome-spectra)
[](https://github.com/erwanp/awesome-spectra)
------------------------------------------------------------------------
[](https://radis.readthedocs.io/)
Raw data
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"keywords": "spectrum, infrared, spectra, radiation, nonequilibrium, spectroscopy, molecules, HITRAN, hitemp, exomol, line-by-line",
"author": "Erwan Pannier",
"author_email": "erwan.pannier@gmail.com",
"download_url": "https://files.pythonhosted.org/packages/72/15/6903d5e02f477e3fd55987039e7a4d9df11e10d447d4e7dfe215a2222fdb/radis-0.15.2.tar.gz",
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"description": "> | [](https://pypi.python.org/pypi/radis)\n> [](https://pypistats.org/packages/radis)\n> [](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)\n> [](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)\n> [](https://readthedocs.org/projects/radis/)\n> [](https://radis.github.io/radis-lab/)\n> | [](https://radis.github.io/slack-invite/)\n> [](https://github.com/radis/radis/graphs/contributors)\n> [](https://app.travis-ci.com/github/radis/radis)\n> [](https://codecov.io/gh/radis/radis)\n> [)](https://lgtm.com/projects/g/radis/radis/alerts)\n> [](https://github.com/radis/radis-benchmark)\n> [](./License.md)\n\n[RADIS](https://radis.readthedocs.io/)\n======================================\n\nRADIS is a fast line-by-line code for high resolution infrared molecular\nspectra (emission / absorption, equilibrium / non-LTE) based on\nHITRAN/HITEMP/ExoMol.\n\nIt includes post-processing tools to compare experimental spectra and\nspectra calculated with RADIS or other spectral codes.\n\nUser full documentation (advanced install and examples) are available on\nthe [RADIS Website](http://radis.readthedocs.io/).\n\nGetting Started\n---------------\n\n### Install\n\nAssuming you have Python installed with the\n[Anaconda](https://www.anaconda.com/download/) distribution you can use\n`pip`:\n\n pip install radis\n\nor `mamba` or `conda` via the conda-forge channel:\n\n conda install radis -c conda-forge\n\n**That\\'s it!** You can now run your first example below. If you\nencounter any issue, or to upgrade the package later, please refer to\nthe [detailed installation\nprocedure](https://radis.readthedocs.io/en/latest/dev/developer.html#label-install)\n.\n\n### Quick Start\n\nCalculate a CO equilibrium spectrum from the HITRAN database :\n\n from radis import calc_spectrum\n s = calc_spectrum(1900, 2300, # cm-1\n molecule='CO',\n isotope='1,2,3',\n pressure=1.01325, # bar\n Tgas=700, # K\n mole_fraction=0.1,\n path_length=1, # cm\n databank='hitran' # or 'hitemp'\n )\n s.apply_slit(0.5, 'nm') # simulate an experimental slit\n s.plot('radiance')\n\n\n\n### Advanced use\n\nThe Quick Start examples automatically downloads the line databases from\n[HITRAN-2016](https://radis.readthedocs.io/en/latest/references/references.html#hitran-2016),\nwhich is valid for temperatures below 700 K. For *high temperature*\ncases, you may need to use other line databases such as\n[HITEMP-2010](https://radis.readthedocs.io/en/latest/references/references.html#hitemp-2010)\n(typically T \\< 2000 K) or\n[CDSD-4000](https://radis.readthedocs.io/en/latest/references/references.html#cdsd-4000)\n(T \\< 5000 K). HITEMP can also be downloaded automatically, or can be\ndownloaded manually and described in a `~/radis.json` [Configuration\nfile](https://radis.readthedocs.io/en/latest/lbl/lbl.html#label-lbl-config-file).\n\nMore complex\n[examples](https://radis.readthedocs.io/en/latest/examples.html#label-examples)\nwill require to use the\n[SpectrumFactory](https://radis.readthedocs.io/en/latest/source/radis.lbl.factory.html#radis.lbl.factory.SpectrumFactory)\nclass, which is the core of RADIS line-by-line calculations.\n[calc\\_spectrum](https://radis.readthedocs.io/en/latest/source/radis.lbl.calc.html#radis.lbl.calc.calc_spectrum)\nis a wrapper to\n[SpectrumFactory](https://radis.readthedocs.io/en/latest/source/radis.lbl.factory.html#radis.lbl.factory.SpectrumFactory)\nfor the simple cases.\n\n### Compare with experiments\n\nExperimental spectra can be loaded using the\n[experimental\\_spectrum](https://radis.readthedocs.io/en/latest/source/radis.spectrum.models.html#radis.spectrum.models.experimental_spectrum)\nfunction and compared with the\n[plot\\_diff](https://radis.readthedocs.io/en/latest/source/radis.spectrum.compare.html#radis.spectrum.compare.plot_diff)\nfunction. For instance:\n\n from numpy import loadtxt\n from radis import experimental_spectrum, plot_diff\n w, I = loadtxt('my_file.txt').T # assuming 2 columns\n sexp = experimental_spectrum(w, I, Iunit='mW/cm2/sr/nm')\n plot_diff(sexp, s) # comparing with spectrum 's' calculated previously\n\nTypical output of\n[plot\\_diff](https://radis.readthedocs.io/en/latest/source/radis.spectrum.compare.html#radis.spectrum.compare.plot_diff):\n\n[](https://radis.readthedocs.io/en/latest/spectrum/spectrum.html#compare-two-spectra)\n\nRefer to the\n[Examples](https://radis.readthedocs.io/en/latest/examples/examples.html)\nsection for more examples, and to the [Spectrum\npage](https://radis.readthedocs.io/en/latest/spectrum/spectrum.html) for\nmore post-processing functions.\n\n### GPU Acceleration\n\nRADIS supports GPU acceleration for super-fast computation of spectra.\nRefer to [GPU Spectrum Calculation on\nRADIS](https://radis.readthedocs.io/en/latest/lbl/lbl.html#calculating-spectrum-using-gpu)\nfor more details on GPU acceleration.:\n\n =======================================\n\n#### Try online (no installation needed!)\n\n\ud83c\udf31 Radis-app \\-\\-\\-\\-\\-\\-\\-\\--\n\nA simple [web-app](https://radis.app/) for RADIS under development -\n[GitHub](https://github.com/suzil/radis-app)\n\n[](https://radis.app/)\n\n\ud83d\udd2c RADIS-lab \\-\\-\\-\\-\\-\\-\\-\\--\n\nAn [online environment](https://github.com/radis/radis-lab) for advanced\nspectrum processing and comparison with experimental data:\n\n- no need to install anything\n- use pre-configured line databases (HITEMP)\n- upload your data files, download your results !\n\n[](https://radis.github.io/radis-lab/)\n\nSee more [on GitHub](https://github.com/radis/radis-lab)\n\n------------------------------------------------------------------------\n\nCite\n----\n\nArticles are available at\n[](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)\n[](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)\n\nFor reproducibility, do not forget to cite the line database used, and\nthe spectroscopic constants if running nonequilibrium calculations. See\n[How to\ncite?](https://radis.readthedocs.io/en/latest/references/references.html#cite)\n\n------------------------------------------------------------------------\n\nDeveloper Guide\n---------------\n\n### Contribute\n\nWant to contribute to RADIS? Join the Slack community and we\\'ll help\nyou through the process. Want to get started immediatly? Nice. Have a\nlook at the the [Developer\nGuide](https://radis.readthedocs.io/en/latest/dev/developer.html).\n\n[](https://github.com/radis/radis/graphs/contributors)\n[](https://radis.github.io/slack-invite/)\n\nRADIS internals are also described in the [full\ndocumentation](https://radis.readthedocs.io/en/latest/index.html)\n\n### License\n\nThe code is available on this repository under [GNU LESSER GENERAL\nPUBLIC LICENSE (v3)](./LICENSE)\n[](./License.md)\n\n------------------------------------------------------------------------\n\nReferences\n----------\n\n### Links\n\n- Documentation:\n [](https://readthedocs.org/projects/radis/)\n- Help:\n [](https://gitter.im/radis-radiation/community)\n [](https://radis.github.io/slack-invite/)\n [Q&A forum](https://groups.google.com/forum/#!forum/radis-radiation)\n- Articles:\n [](https://linkinghub.elsevier.com/retrieve/pii/S0022407318305867)\n [](https://linkinghub.elsevier.com/retrieve/pii/S0022407320310049)\n- Source Code:\n [](https://github.com/radis/radis/stargazers)\n [](https://github.com/radis/radis/graphs/contributors)\n [](./License.md)\n- Test Status:\n [](https://app.travis-ci.com/github/radis/radis)\n [](https://codecov.io/gh/radis/radis)\n [](https://github.com/radis/radis-benchmark)\n- PyPi Repository:\n [](https://pypi.python.org/pypi/radis)\n [](https://pypistats.org/packages/radis)\n- Interactive Examples:\n [radis\\_examples](https://github.com/radis/radis-examples)\n [](https://github.com/radis/radis-examples)\n [](https://radis.github.io/radis-lab/)\n- [Fitroom](https://github.com/radis/fitroom) (for advanced\n multidimensional fitting).\n\n### Other Spectroscopic tools\n\nSee [awesome-spectra](https://github.com/erwanp/awesome-spectra)\n[](https://github.com/erwanp/awesome-spectra)\n\n------------------------------------------------------------------------\n\n[](https://radis.readthedocs.io/)\n",
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