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# CAXS Wiki home page
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## Synopsis
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CAXS stands for "Calculate Absorption Cross Sections". The software is capable of calculating the absorption cross
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sections of any species over a wide range of wavenumbers. Individual species can be combined together (for example
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using isotopic ratios). The cross sections can be calculated either using a pressure-temperature profile or a grid of
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pressures and temperatures.
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For the methane (CH4) species, lines data from [Rey et al. 2017](http://theorets.tsu.ru/molecules.ch4.hybrid) can be
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used.
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## Motivation
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CAXS is meant to be easy to use and parametrize, and its outputs easily transportable.
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It is written in Fortran, and should be easy to understand, maintain and modify.
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## Installation
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Visit the CAXS [installation instructions page](/dblain/pytheas/wikis/how-to-install).
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The installation process is also detailed in the *README*.
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## Getting started
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Learn how to use CAXS by following the tutorials on the [CAXS getting started page](/dblain/pytheas/wikis/getting-started).
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Instructions to setup and launch the software are also available in the *README*.
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## Documentation
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Details about CAXS can be found in the [CAXS documentation](/dblain/pytheas/wikis/documentation). |
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