Multispectrum rotational states distribution thermometry: Application to the 3ν 1+ ν 3band of carbon dioxide
| Autor: | Julian Robinson-Tait, Wilhelm Kaenders, Felix Rohde, Szymon Wójtewicz, Patrick Leisching, Davide Gatti, Yuriy Mayzlin, Marco Lamperti, Rafal Wilk, Thomas Puppe, Riccardo Gotti, Bidoor Alsaif, Marco Marangoni, Paolo Laporta |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | New journal of physics 22 (2020). doi:10.1088/1367-2630/aba85d info:cnr-pdr/source/autori:Gotti, R.; Lamperti, M.; Gatti, D.; Wojtewicz, S.; Puppe, T.; Mayzlin, Y.; Alsaif, B.; Robinson-Tait, J.; Rohde, F.; Wilk, R.; Leisching, P.; Kaenders, W. G.; Laporta, P.; Marangoni, M./titolo:Multispectrum rotational states distribution thermometry: application to the 3 nu(1)+nu(3)band of carbon dioxide/doi:10.1088%2F1367-2630%2Faba85d/rivista:New journal of physics/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume:22 |
| Popis: | In this paper we propose multispectrum rotational states distribution thermometry as an optical method for primary thermometry. It relies on a global fitting of multiple absorption lines of the same band at different pressures. The approach allows leveraging both the temperature-dependent Doppler width and the temperature-dependent distribution of line intensities across the ro-vibrational band. We provide a proof-of-principle demonstration of the approach on the 3ν 1 + ν 3 band of CO2, for which several accurate line-strength models of both theoretical and experimental origin are available for the global fitting. Our experimental conditions do not allow to test the methodology beyond a combined uncertainty of 530 ppm, but the comparative analysis between different line-strength models shows promise to reduce the error budget to few tens of ppm. As compared to Doppler-broadening thermometry, the approach is advantageous to mitigate systematic errors induced by a wrong modelling of absorption line-shapes and to reduce, for a given experimental dataset, the statistical uncertainty by a factor of 2. When applied in a reverse way, i.e. using a gas of known temperature, the approach becomes a stringent testbed for the accuracy of the adopted line-strength model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|