Projects per year
Abstract
To meet the challenges of high-resolution molecular spectroscopy, increasingly sophisticated spectroscopic techniques were developed. For a long time FTIR and laser-based spectroscopies were used for these studies. The recent development of dual-comb spectroscopy at high-resolution makes this technique a powerful tool for gas phase studies. We report on the use and characterization of the IRis-F1, a tabletop mid-infrared dual-comb spectrometer, in the newly developed step-sweep mode. The resolution of the wavenumber axis is increased by step-wise tuning (interleaving) and accurate measurement of the laser center wavelength and repetition frequency. Doppler limited measurements of N2O and CH4 reveal a wavenumber accuracy of 10−4 cm−1 on the covered range of > 50 cm−1. Measured half-widths of absorption lines show no systematic broadening, indicating a negligible instrument response function. Finally, measurements of nitrogen pressure broadening coefficients in the ν4 band of methane show that quantum cascade laser dual-comb spectroscopy in step-sweep mode is well adapted for measurements of precision spectroscopic data, in particular line shape parameters.
Original language | English |
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Article number | 108239 |
Pages (from-to) | 108239 |
Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
Volume | 287 |
DOIs | |
Publication status | Published - Sept 2022 |
Keywords
- High-resolution dual-comb spectroscopy
- Mid-infrared
- N2-collisional broadening of methane lines
- Quantum cascade laser frequency comb
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Dive into the research topics of 'A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy'. Together they form a unique fingerprint.Projects
- 1 Finished
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Experimental and theoretical study of line shape parameters and their temperature dependence for infrared absorption lines of molecules with atmospheric interest
Vispoel, B. (PI) & Lepere, M. (Supervisor)
1/10/21 → 30/09/24
Project: Research
Equipment
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Optics, Lasers and spectroscopy
Lepere, M. (Manager)
Technological Platform Optics, Lasers and spectroscopyFacility/equipment: Technological Platform