title: Frequency-comb-assisted precision laser spectroscopy of CHF3 around 8.6 μm.
abstract: We report a high-precision spectroscopic study of room-temperature trifluoromethane around 8.6 μm, using a CW quantum cascade laser phase-locked to a mid-infrared optical frequency comb. This latter is generated by a nonlinear down-conversion process starting from a dual-branch Er:fiber laser and is stabilized against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several transitions falling in the υ5 vibrational band are recorded with a frequency resolution of 20 kHz. Due to the very dense spectra, a special multiple-line fitting code, involving a Voigt profile, is developed for data analysis. The combination of the adopted experimental approach and survey procedure leads to fractional accuracy levels in the determination of line center frequencies, down to 2 × 10(-10). Line intensity factors, pressure broadening, and shifting parameters are also provided.
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Alessio
authors.initials: A
authors.lastname: Gambetta
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Coluccelli
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Cassinerio
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Toney Teddy
authors.initials: TT
authors.lastname: Fernandez
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Gatti
authors.affiliation: Dipartimento di Matematica e Fisica - Seconda Università di Napoli, Viale Lincoln 5, 81100 Caserta, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Castrillo
authors.affiliation: Laboratoire de Mathématiques et Physique, Université de Perpignan, Via Domitia EA 4217, F-66860 Perpignan, France.
authors.forename: Adina
authors.initials: A
authors.lastname: Ceausu-Velcescu
authors.affiliation: Dipartimento di Matematica e Fisica - Seconda Università di Napoli, Viale Lincoln 5, 81100 Caserta, Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Fasci
authors.affiliation: Dipartimento di Matematica e Fisica - Seconda Università di Napoli, Viale Lincoln 5, 81100 Caserta, Italy.
authors.forename: Livio
authors.initials: L
authors.lastname: Gianfrani
authors.affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, NA, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Santamaria
authors.affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, NA, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Di Sarno
authors.affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, NA, Italy.
authors.forename: Pasquale
authors.initials: P
authors.lastname: Maddaloni
authors.affiliation: INFN, Istituto Nazionale di Fisica Nucleare, Sez. Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino, FI, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: De Natale
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Laporta
authors.affiliation: Dipartimento di Fisica - Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano