Odintsova, TA;
Fasci, E;
Moretti, L;
Zak, EJ;
Polyansky, OL;
Tennyson, J;
Gianfrani, L;
(2017)
Highly accurate intensity factors of pure CO2 lines near 2 μm.
Journal of Chemical Physics
, 146
(24)
, Article 244309. 10.1063/1.4989925.
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Abstract
Line intensities for carbon dioxide are measured with a novel spectroscopic approach, assisted by an optical frequency comb synthesizer for frequency calibration purposes. The main feature of the spectrometer consists in the exploitation of optical feedback from a V-shaped high-finesse optical resonator to effectively narrow a distributed feedback diode laser at the wavelength of 2 µm. Lasergas interaction takes place inside an isothermal cell, which is placed on the transmission from the cavity. High quality, self-calibrated, absorption spectra are observed in pure CO2 samples at different gas pressures, in coincidence with three lines of the R-branch of the ν1 + 2ν2 + ν3 band. Line intensities are determined using a global fitting approach in which a manifold of spectra are simultaneously analyzed across the range of pressures between 5 and 100 Torr, sharing a restricted number of unknown parameters. Various sources of uncertainty have been identified and carefully quantified, thus leading to an overall uncertainty ranging between 0.17% and 0.23%. The measured values are in a very good agreement with recent ab initio predictions.
| Type: | Article |
|---|---|
| Title: | Highly accurate intensity factors of pure CO2 lines near 2 μm |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.4989925 |
| Publisher version: | http://doi.org/10.1063/1.4989925 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, ENHANCED ABSORPTION-SPECTROSCOPY, WAVE COHERENT TRANSIENTS, SPEED DEPENDENCE, RETRIEVALS, SELF, CH3F |
| 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.ucl.ac.uk/id/eprint/1565067 |
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