High-accuracy 12C16O2 line intensities in the 2 µm wavelength region measured by frequency-stabilized cavity ring-down spectroscopy. (February 2018)

• Record Type: Journal Article
• Authors: Yi, Hongming; Liu, Qingnan; Gameson, Lyn; Fleisher, Adam J.; Hodges, Joseph T.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 206(2018)
• Page Start: 367
• Page End: 377
• Publication Date: 2018-02
• Subjects: Precision molecular spectroscopy -- Line lists -- Carbon dioxide -- Cavity ring-down spectroscopy -- Infrared spectroscopy -- Dipole moment surfaces; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2017.12.008
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Accurate transition intensities were measured by FS-CRDS for 19 12 C 16 O2 transitions near λ = 2 µm. Comparisons with existing data bases reveal systematic biases as large as 3%, relative to the NIST intensities. Agreement with computational PES and ab initio DMS predictions is on average <0.3%. Subtle m -dependent deviations of the NIST intensities from the ab initio DMS predictions are observed. Abstract: Reported here are highly accurate, experimentally measured ro-vibrational transition intensities for the R-branch of the (20012)–(00001) 12 C 16 O2 band near λ = 2 µm. Measurements were performed by a frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) instrument designed to achieve precision molecular spectroscopy in this important region of the infrared. Through careful control and traceable characterization of CO2 sample conditions, and through high-fidelity measurements spanning several months in time, we achieve relative standard uncertainties for the reported transition intensities between 0.15 % and 0.46 %. Such high accuracy spectroscopy is shown to provide a stringent test of calculated potential energy and ab initio dipole moment surfaces, and therefore transition intensities calculated from first principles.