Lineshape test on overlapped transitions (R9F1, R9F2) of the 2v3 band of 12CH4 by frequency-stabilized cavity ring-down spectroscopy
| Autor: | X.J. Feng, L. Yang, M.D. Plimmer, J.-T. Zhang, H. Lin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Voigt profile
Radiation Materials science 010504 meteorology & atmospheric sciences Spectrometer Binary number First order 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics Spectral line Cavity ring-down spectroscopy Yield (chemistry) Attenuation coefficient 0103 physical sciences 010306 general physics Spectroscopy 0105 earth and related environmental sciences |
| Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer. 210:82-90 |
| ISSN: | 0022-4073 |
| Popis: | The performances of a multi-spectral fit for the spectra of pressure-broadened overlapping lines (R9F1, R9F2) of 12CH4 in binary mixtures with N2 were studied by applying different lineshape models, from the simplest Voigt profile (VP) to the Harmann-Tran profile (HTP). Line-mixing was approximated in the first order in the spectral fits. Data were acquired using a high-resolution cavity ring-down spectrometer of minimum detectable absorption coefficient of 2.8 × 10−12 cm−1. The lines were observed with a signal-to-noise ratio of 19 365 for pressures from 5 to 40 kPa. The study reveals that the multi-spectral fits using the HTP and the speed-dependent Nelkin–Ghatak profile (SDNGP) yield the best among all tested. The two models gave the maximum relative residuals of less than 0.065 %. All things considered, the HTP and the SDNGP appear to be the most reliable models for treating the present case of multi-spectral fitting of unresolved dual-component spectra. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect