Germann, M;
Hjältén, A;
Boudon, V;
Richard, C;
Tennyson, J;
Yurchenko, S;
Gordon, IE;
... Foltynowicz, A; + view all
(2023)
High Accuracy Line Lists of CH4 and H2CO in the 8 µm Range from Optical Frequency Comb Fourier Transform Spectroscopy.
In:
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC).
IEEE
Preview |
Text
Yurchenko_CH4_H2O_EQEC_2023.pdf Download (339kB) | Preview |
Abstract
Spectral data in the 8 µm region - a water window where many molecules show strong rovibrational features - are currently derived mostly from conventional FTIR measurements, with line position uncertainties of the order of a few to few tens of MHz [1]. Recently, we developed a Fourier transform spectrometer (FTS) based on a compact 8 μm frequency comb that allows line position retrieval with sub-MHz accuracy [2]. We record and interleave spectra at different repetition rates to obtain sampling point spacing of ~10 MHz using the sub-nominal resolution sampling-interleaving method to analyze the FTS data [3]. Here, we use this spectrometer to measure high-resolution absorption spectra of two species important in atmospheric sensing and astrophysics: methane, Fig. 1(a), a greenhouse gas and a constituent of exoplanetary atmospheres, and formaldehyde, Fig. 1(c), a toxic pollutant and a species found in the interstellar medium. By fitting Voigt functions to the individual absorption lines in spectra measured over a wide range of partial pressures, we determine center frequencies of transitions with intensities spanning more than 3 orders of magnitude, with typical uncertainties of a few hundred kHz.
| Type: | Proceedings paper |
|---|---|
| Title: | High Accuracy Line Lists of CH4 and H2CO in the 8 µm Range from Optical Frequency Comb Fourier Transform Spectroscopy |
| Event: | CLEO/Europe-EQEC 2023 |
| Location: | Munich, Germany |
| Dates: | 26 Jun 2023 - 30 Jun 2023 |
| ISBN-13: | 9798350345995 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/CLEO/EUROPE-EQEC57999.2023.10232703 |
| Publisher version: | http://dx.doi.org/10.1109/cleo/europe-eqec57999.20... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10185372 |
Archive Staff Only
 |
View Item |
