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Updated: May 6, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Investigation of effective line strengths of N2O4 at 7.8 μm using a continuous-wave quantum cascade laser
Qizhi Zhu1, Shuaikang Yin1, Xin Shi1
1State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology, Institutes of Physical Science and Information Technology, Anhui University, 230601 Hefei, China.
Abstract:
The spectral line positions and effective line strengths of dinitrogen tetroxide (N2O4) in the range of 1279.8-1282.5 cm-1 were measured using a continuous-wave quantum cascade laser spectrometer. A data processing program developed in MATLAB was used to fit the spectral data with Voigt, Rautian, and Galatry line profiles. The performance of different spectral line profiles was evaluated, and the Rautian profile achieved the best fit with faster calculations, making it ideal for real-time and long-term monitoring. The maximum uncertainties in the measured line positions and intensities are 1.95*10-3 cm-1 and 6.47 %, respectively. The line position uncertainty is mainly from reference spectral lines, while intensity uncertainty is due to N2O4 concentration calculations and fitting errors. These results aid in gas leak monitoring and spectral analysis of N2O4, as well as in studying nitrogen oxide reaction processes.
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