Spectroscopic-network-assisted precision spectroscopy and its application to water

Frequency combs and cavity-enhanced optical techniques have revolutionized molecular spectroscopy: their combination allows recording saturated Doppler-free lines with ultrahigh precision. Network theory, based on the generalized Ritz principle, offers a powerful tool for the intelligent design and...

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Bibliographic Details
Published in:Nature communications 2020-04, Vol.11 (1), p.1708-1708, Article 1708
Main Authors: Tóbiás, Roland, Furtenbacher, Tibor, Simkó, Irén, Császár, Attila G., Diouf, Meissa L., Cozijn, Frank M. J., Staa, Joey M. A., Salumbides, Edcel J., Ubachs, Wim
Format: Article
Language:English
Subjects:
639/638/440
639/638/440/527/2257
Accuracy
Astrophysics
Calibration
Combustion chemistry
Energy
Energy levels
Experiments
Humanities and Social Sciences
Measurement techniques
Molecular spectroscopy
multidisciplinary
Optics
Science
Science (multidisciplinary)
Spectroscopic analysis
Spectroscopy
Wavelengths
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Summary:Frequency combs and cavity-enhanced optical techniques have revolutionized molecular spectroscopy: their combination allows recording saturated Doppler-free lines with ultrahigh precision. Network theory, based on the generalized Ritz principle, offers a powerful tool for the intelligent design and validation of such precision-spectroscopy experiments and the subsequent derivation of accurate energy differences. As a proof of concept, 156 carefully-selected near-infrared transitions are detected for H 2 16 O, a benchmark system of molecular spectroscopy, at kHz accuracy. These measurements, augmented with 28 extremely-accurate literature lines to ensure overall connectivity, allow the precise determination of the lowest ortho -H 2 16 O energy, now set at 23.794 361 22(25) cm −1 , and 160 energy levels with similarly high accuracy. Based on the limited number of observed transitions, 1219 calibration-quality lines are obtained in a wide wavenumber interval, which can be used to improve spectroscopic databases and applied to frequency metrology, astrophysics, atmospheric sensing, and combustion chemistry. Precision-spectroscopy techniques can accurately measure lines in constrained frequency and intensity ranges. The authors propose a spectroscopic-network-assisted precision spectroscopy method by which transitions measured in a narrow range provide information in other, extended regions of the spectrum.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-15430-6