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Deducing rotational quantum-state distributions from overlapping molecular spectra

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VORÁČ Jan KUSÝN Lukáš SYNEK Petr

Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj REVIEW OF SCIENTIFIC INSTRUMENTS
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1063/1.5128455
Doi http://dx.doi.org/10.1063/1.5128455
Klíčová slova DIELECTRIC BARRIER DISCHARGE; ATOMIC-ABSORPTION-SPECTROMETRY; TRANSITION-PROBABILITIES; TEMPERATURE; RATIO; AIR; 1ST
Popis A novel method for fast and robust calculation of Boltzmann plots from molecular spectra is presented. Its use is demonstrated on the OH(A-X) spectrum near 310 nm. A limitation of the method is identified: for overlapping spectra of the OH(A-X) and N-2(C-B, Delta v = 1) band sequence, the calculation may often fail due to insufficient number of measured points. This is solved by introducing experimentally determined bounds for the N-2(C) rotational distribution. Three cases are presented: (i) with undisturbed OH(A-X) emission, (ii) with strong emission of N-2(C-B) in the said spectral range, and (iii) with weak but not negligible nitrogen emission. In case (ii), the data in the spectral range 306-320 nm are sufficient for the analysis. In case (iii), information from another spectral range with undisturbed N-2(C-B) emission is necessary. These illustrate all relevant cases often encountered in laboratory plasmas. The calculated Boltzmann plots are not further analyzed in this article but can be used for development and validation of kinetic models with rotational resolution. The implementation of the reported method using the massiveOES software package written in the Python language is available in the https://doi.org/10.1063/1.5128455#suppl supplementary material.
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