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ORIGINAL RESEARCH article

Front. Phys.
Sec. Optics and Photonics
Volume 12 - 2024 | doi: 10.3389/fphy.2024.1446803
This article is part of the Research Topic Cavity-enhanced optical spectroscopy View all 5 articles

High precision HD spectroscopy around 1.53 µm

Provisionally accepted
Riccardo Gotti Riccardo Gotti 1Szymon Wójtewicz Szymon Wójtewicz 2Davide Gatti Davide Gatti 3*Marco Marangoni Marco Marangoni 3Marco Lamperti Marco Lamperti 4
  • 1 Department of Industrial and Information Engineering, University of Pavia, Pavia, Lombardy, Italy
  • 2 Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Toruń, Pomeranian, Poland
  • 3 Physics, Polytechnic University of Milan, Milan, Italy
  • 4 Department of Science and High Technology, University of Insubria, Como, Italy

The final, formatted version of the article will be published soon.

    We report highly precise and accurate measurements of the P(5), P(6) and O(3) transitions of the 2-0 band of HD occurring near 1.5 µm. HD spectra were acquired in the pressure range from 100 to 900 Torr with a cavity ring-down spectrometer linked to an optical frequency comb. The line-shape analysis was performed using the Hartmann-Tran profile in the so-called β-corrected version. For the P(5) transition we improve the accuracy of previous line center frequency determinations by more than two orders of magnitude. Moreover, for the P(5) and P(6) line centers the total standard uncertainty is below 3 MHz, similar to those provided by quantum electrodynamics predictions and thus useful for direct comparisons that might foster future improvements of the theoretical model.

    Keywords: Precision molecular spectroscopy, HD spectroscopy, Cavity Ring-Down Spectroscopy, Optical frequency comb, Line position

    Received: 10 Jun 2024; Accepted: 26 Aug 2024.

    Copyright: © 2024 Gotti, Wójtewicz, Gatti, Marangoni and Lamperti. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Davide Gatti, Physics, Polytechnic University of Milan, Milan, Italy

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