Scientific Results

Absolute frequency metrology of the CHF3 8.6-mu m ro-vibrational spectrum at 10(-11) level

Year: 2020

Authors: Vicentini E., Maddaloni P., Aiello R., Gambetta A., Coluccelli N., Molteni LM., Castrillo A., Gianfrani L., De Natale P., Laporta P., Galzerano G.

Autors Affiliation: Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy;‎ CNR, Ist Foton & Nanotecnol, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy; CNR, Ist Nazl Ott, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy;‎ Ist Nazl Fis Nucl, Sez Napoli, Complesso Univ MS Angelo,Via Cintia, I-80126 Naples, Italy; Univ Campania Luigi Vanvitelli, Dipartimento Matemat & Fis, Viale Lincoln 5, I-81100 Caserta, Italy;‎ CNR, Ist Nazl Ott, Largo E Fermi 6, I-50125 Florence, Italy;‎ Ist Nazl Fis Nucl, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy

Abstract: An optical-frequency-comb-referenced quantum cascade laser is used to perform wavelength-modulation Lamb-dip spectroscopy on a large number of ro-vibrational transitions falling in the CHF3 upsilon(5) fundamental band at 8.6 mu m. The combined (statistical + systematic) fractional uncertainty in the absolute determination of the line-center frequencies ranges from 9 x 10(-11) down to 2 x 10(-11). This represents an improvement by more than two orders of magnitude, as compared to a recent and extensive study performed with a high-resolution FTIR spectrometer [1]. Our investigation realizes a sharpened knowledge of the CHF3 spectrum over a wide interval, also managing to accurately determine the positions of very close, previously unresolved multiple ro-vibrational components. (C) 2020 Elsevier Ltd. All rights reserved.

Journal/Review: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

Volume: 248      Pages from: 106963-1  to: 106963-7

KeyWords: Wavelength-modulation Lamb-dip spectroscopy; Optical-frequency-comb-assisted absolute frequency metrology; CHF3 ro-vibrational spectrum
DOI: 10.1016/j.jqsrt.2020.106963

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