Scientific Results

Frequency-comb-assisted absolute calibration and linestrength of H12C13CH ro-vibrational transitions in the 2v3 band

Year: 2018

Authors: Di Sarno V., De Natale P., Tasseva J., Santamaria L., Cané E., Tamassia F., Maddaloni P.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino, Italy; ASI, Agenzia Spaziale Italiana, Contrada Terlecchia, I-75100 Matera, Italy; Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy

Abstract: We report on a precision spectroscopic study of room-temperature H12C13CH in the 6463–6520 cm − 1 range, using a continuous-wave diode laser phase-locked to a near-infrared optical frequency comb synthesizer stabilized, in turn, against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several ro-vibrational transitions in the P and R branches of the 2ν 3 overtone band are recorded. Accuracy levels as low as 100 kHz, 5 · 10 − 10 in fractional terms, are obtained in the determination of absolute line-center frequencies. In addition, line intensities are measured for the first time, with a best fractional uncertainty of 1%, and used to retrieve the purely vibrational transition dipole moment in conjunction with the first-order Herman–Wallis factor. Finally, the pressure broadening coefficients γself are also derived for the studied transitions.

Journal/Review: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

Volume: 206      Pages from: 31  to: 35

KeyWords: 2v3 Infrared band; Absolute frequency metrology; H12C13CH; Infrared devices; Spectroscopic analysis, Absolute frequency; H^12C^13CH; Infrared bands; Linestrength; Ro-vibrational spectroscopies, Laser mode locking, calibration; carbon isotope; hydrogen isotope; precision; spectroscopy; vibration
DOI: 10.1016/j.jqsrt.2017.10.030

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