A versatile modeling tool for NO and LIF spectra

LIFSim is a software tool that allows to simulate absorption and LIF spectra (excitation and emission) for NO and O2. Correction factors for imaging diagnostics can be evaluated. Spectroscopic data of NO A-X and O2 B-X is implemented. The simulations include pressure line broadening and shifiting, and quenching. LIF signals are calculated using a three-level non-transient linear model.

Using LIFSim and downloading the results is free! If you use this tool, please cite:
W. G. Bessler, C. Schulz, V. Sick, and J. W. Daily, "A versatile modeling tool for nitric oxide LIF spectra", Proceedings of the Third Joint Meeting of the U.S. Sections of The Combustion Institute (Chicago, March 16-19, 2003, paper PI05).
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Updated Data, LIFSim-Version 3.18


Since 2009, LIFSim uses new quenching data from [Settersten09]. This means, the quenching data cited in the 2003 article is no longer in use. If you are using LIFSim, please also cite:

Thomas B. Settersten, Brian D. Patterson and William H. Humphries IV, "Radiative lifetimes of NO A 2Σ+ (v' = 0,1,2...) and the electronic transition moment of the A 2Σ+-X 2Π",
J. Chem. Phys. 131,104309 (2009).

Now available:

The LIFSim Web Interface

Click on the left side to calculate NO or O2 absorption spectra, LIF-excitation spectra, LIF-emission spectra, or the temperature and pressure dependence of LIF signals.

A description of the LIFSim functionality and the spectroscopic background was presented in the Proceedings of the Third Joint Meeting of the U.S. Sections of the Combustion Institute, March, 2003. Please click here to download: Bessler et al LIFSim 2003

For further information please contact Christof Schulz or Wolfgang Bessler


Wolfgang G. Bessler
Department of Mechanical and Process Engineering, Offenburg University of Applied Sciences

Christof Schulz
IVG, Institute for Combustion and Gasdynamics, University of Duisburg-Essen

Volker Sick
Department of Mechanical Engineering, The University of Michigan

John W. Daily
Department of Mechanical Engineering, University of Colorado, Boulder

Acknowledgements: This material is based upon work supported by the German Research Foundation (DFG) and National Science Foundation under Grant No. 0087337. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.