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

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Abstract

Quantitative determination of atmospheric CO2 concentration by remote sensing relies on accurate line parameters. Lamb dips of the lines up to J′′ = 72 in the 30013–00001 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 30013–00001 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

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Article information


Submitted
17 Sep 2019
Accepted
03 Jan 2020
First published
06 Jan 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

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, Advance Article , DOI: 10.1039/C9CP05121J

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