A python based rapid and accurate broadband gas spectrum simulator that supports both Voigt and HTP based line shapes. Orders of magnitude faster than HAPI for spectra with more than 1000 absorption transitions. Based on a natively written OpenCL implementation of the complex error function which is derived from [http://ab-initio.mit.edu/wiki/index.php/Faddeeva_Package].
Clone the repo
git clone https://github.com/CharlieCallahan/GPU_Accelerated_Absorption_Sim.gitInstall the requirements
python install.pyThe repo comes with an example GUI to get you started. Run it with the following command:
python gaasGUI.py
Additionally, the repo includes some example code to demonstrate how to run spectrum simulations using GAAS (example_voigt.py and example_htp.py).
Please cite us if you use this code in your research. doi: https://doi.org/10.1016/j.jqsrt.2024.109307
Charles S. Callahan, Sean M. Bresler, Sean C. Coburn, David A. Long, Gregory B. Rieker, GAAS: GPU accelerated absorption simulator, Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 333, 2025, 109307, ISSN 0022-4073
