Rovibrational fine structure and transition dipole moment of CF3H by frequency-comb-assisted saturated spectroscopy at 8.6μm

Year: 2018

Authors: Vicentini E., Gambetta A., Coluccelli N., Fasci E., Castrillo A., Gianfrani L., Di Sarno V., Maddaloni P., Ceausu-Velcescu A., De Natale P., Wang,Y., Fernandez T.T., Laporta P., Galzerano G.

Autors Affiliation: Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy; Istituto di Fotonica
e Nanotecnologie-CNR, Piazza Leonardo da Vinci 32, Milano 20133, Italy; Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli”, Viale Lincoln 5, Caserta 81100, Italy; Istituto Nazionale di Ottica – CNR, Via Campi Flegrei 34, Pozzuoli(NA) 80078, Italy e INFN, Istituto Nazionale di Fisica Nucleare, Sez.
di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, Napoli, 80126 Italy; Laboratoire de Mathématiques et
Physique, Université de Perpignan, Via Domitia EA 4217, Perpignan F-66860, France; Istituto Nazionale di Ottica – CNR, Largo E. Fermi, 6, Firenze 50125 Italy

Abstract: We report on rovibrational fine structure spectroscopy of room-temperature trifluoromethane with a saturated absorption method, using a quantum cascade laser at around 8.6 ?m phase-locked to a self-referenced mid-infrared frequency comb synthesizer. The absolute line-center frequencies of 36 lines have been measured by means of the wavelength modulation method with a best fractional uncertainty of ~3CH10 in a single acquisition scan from 34.7426 to 34.7443 THz. In addition, an extensive investigation of the measured Lamb-dip profiles using both direct pump-probe spectroscopy method and wavelength modulation technique has been performed for two selected lines, R(64) and rR(38), belonging to the ? vibrational band, as a function of either the gas pressure or the pump beam power. This approach allowed the measurement of the main spectroscopic parameters, such as saturation intensity, transition electric dipole moment, as well as self-pressure broadening coefficient.


Volume: 217      Pages from: 373  to: 379

KeyWords: Comb-assisted spectroscopy; High-resolution molecular spectroscopy; Saturated spectroscopy; Atomic physics; Dipole moment; Electric dipole moments; Modulation; Molecular spectroscopy; Quantum cascade lasers; Spectroscopic analysis, Fine-structure spectroscopy; High resolution; Mid-infrared frequency combs; Pressure-broadening coefficients; Pump-probe spectroscopy; Saturated absorptions; Spectroscopic parameters; Transition dipole moments, Laser mode locking, absorption; chemical compound; methane; spectral resolution; spectroscopy; uncertainty analysis; vibration
DOI: 10.1016/j.jqsrt.2018.06.013

Citations: 2
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