On the 12C2H2 near-infrared spectrum: absolute transition frequencies and an improved spectroscopic network at the kHz accuracy level

Castrillo, Antonio; Fasci, Eugenio; Furtenbacher, Tibor; D'Agostino, Vittorio; Khan, Muhammad A.; Gravina, Stefania; Gianfrani, Livio; Császár, Attila G.

doi:10.1039/d3cp01835k

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d3cp01835k

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On the ¹²C₂H₂ near-infrared spectrum: absolute transition frequencies and an improved spectroscopic network at the kHz accuracy level

Antonio Castrillo,

Eugenio Fasci,

Tibor Furtenbacher

et al.

Abstract: The absolute frequency of several C2H2 rovibrational transitions, carefully selected by the theory of spectroscopic network, has been measured with an accuracy of 15 kHz. Based on the MARVEL procedure, para- and ortho-energy levels were determined.

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Cited by 5 publications

References 65 publications

(172 reference statements)

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Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

Gianfrani,

Hu,

Ubachs

2024

Riv. Nuovo Cim.

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Cavity-enhanced spectroscopic techniques are highly sensitive laser-based methods for interrogating the atomic and molecular constituents of any gaseous medium that is confined into an optical resonator. A first advantage over conventional absorption spectroscopy comes from the extremely long path length of the laser radiation inside the stable, high-finesse, optical cavity, which allows the sample to be probed over several tens of kilometers. After more than 30 years of research and development, techniques like cavity ring-down spectroscopy, cavity-enhanced absorption spectroscopy, and noise-immune cavity-enhanced optical-heterodyne molecular spectroscopy, have reached extraordinary levels of detection sensitivity, such that it is possible to measure light absorption from molecules in trace amounts or extremely weak spectral lines of more abundant species. A second advantage of the use of high-finesse cavities lies in the power amplification achieved inside the optical resonator, making it possible to saturate even weak transitions, thus reducing the width of spectral lines by some three orders of magnitude. Combining these methods with frequency comb technologies has further enhanced their capabilities, adding metrology-grade qualities to spectroscopic determinations such as transition frequencies of molecular resonances, which can be measured with sub-kHz accuracy. In this review article, we discuss the current status of highly precise and highly sensitive laser spectroscopy for fundamental tests and measurements. We describe state-of-the-art molecular spectroscopy methods and their application to a few selected molecules of fundamental importance in understanding quantum chemistry theories or testing quantum electrodynamics.

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Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

Gianfrani,

Hu,

Ubachs

2024

Riv. Nuovo Cim.

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show abstract

Spectroscopic heat maps reveal how to design experiments to improve the uncertainties of transitions and energy levels present in line-by-line databases

Árendás,

Furtenbacher,

Császár

2024

Journal of Quantitative Spectroscopy and Radiative Transfer

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Empirical rovibrational energy levels for nitrous oxide

Tennyson,

Furtenbacher,

Yurchenko

et al. 2024

Journal of Quantitative Spectroscopy and Radiative Transfer

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On the ¹²C₂H₂ near-infrared spectrum: absolute transition frequencies and an improved spectroscopic network at the kHz accuracy level

Abstract: The absolute frequency of several C2H2 rovibrational transitions, carefully selected by the theory of spectroscopic network, has been measured with an accuracy of 15 kHz. Based on the MARVEL procedure, para- and ortho-energy levels were determined.

Cited by 5 publications

References 65 publications

Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

Spectroscopic heat maps reveal how to design experiments to improve the uncertainties of transitions and energy levels present in line-by-line databases

Empirical rovibrational energy levels for nitrous oxide

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