Issue 5, 2020

A well-isolated vibrational state of CO2 verified by near-infrared saturated spectroscopy with kHz accuracy

Abstract

Quantitative determination of atmospheric CO2 concentration by remote sensing relies on accurate line parameters. Lamb dips of the lines up to Jā€²ā€² = 72 in the 30013ā€“00001 band at 1605 nm were measured using a comb-locked cavity ring-down spectrometer, and the positions were determined with an accuracy of a few kHz. A simple effective Hamiltonian model can fit the rotational energies in the 30013 state ideally within the experimental accuracy, indicating that the vibrational state is well-isolated and can be regarded as free from perturbations. From a comparison between other bands using a similar analysis, we conclude that the transitions in the 30013ā€“00001 band could be more suitable as reference lines for sensing applications with the potentially improved line parameter accuracy.

Graphical abstract: A well-isolated vibrational state of CO2 verified by near-infrared saturated spectroscopy with kHz accuracy

Supplementary files

Article information

Article type
Paper
Submitted
17 Sep 2019
Accepted
03 Jan 2020
First published
06 Jan 2020

Phys. Chem. Chem. Phys., 2020,22, 2841-2848

A well-isolated vibrational state of CO2 verified by near-infrared saturated spectroscopy with kHz accuracy

H. Wu, C. Hu, J. Wang, Y. R. Sun, Y. Tan, A. Liu and S. Hu, Phys. Chem. Chem. Phys., 2020, 22, 2841 DOI: 10.1039/C9CP05121J

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