Multiplexed direct-frequency-comb Vernier spectroscopy of carbon dioxide 2ν1 + ν3 ro-vibrational combination band

M Siciliani de Cumis; R Eramo; N Coluccelli; G Galzerano; P Laporta; P Cancio Pastor

doi:10.1063/1.5008461

Multiplexed direct-frequency-comb Vernier spectroscopy of carbon dioxide 2ν₁ + ν₃ ro-vibrational combination band

J Chem Phys. 2018 Mar 21;148(11):114303. doi: 10.1063/1.5008461.

Authors

M Siciliani de Cumis¹, R Eramo², N Coluccelli³, G Galzerano³, P Laporta³, P Cancio Pastor²

Affiliations

¹ Agenzia Spaziale Italiana, Contrada Terlecchia, Matera, Italy.
² Istituto Nazionale di Ottica-CNR, Dipartimento di Fisica-Università degli Studi di Firenze and European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, Sesto Fiorentino, Italy.
³ Dipartimento di Fisica-Politecnico di Milano and Istituto di Fotonica e Nanotecnologie-CNR, Piazza Leonardo da Vinci 32, Milano, Italy.

PMID: 29566527
DOI: 10.1063/1.5008461

Abstract

We investigated a set of nineteen ¹²C¹⁶O₂ transitions of the 2ν₁ + ν₃ ro-vibrational band in the spectral region from 5064 to 5126 cm^-1 at different pressures, using frequency-comb Vernier spectroscopy. Our spectrometer enabled the systematic acquisition of molecular absorption profiles with high precision. Spectroscopic parameters, namely, transition frequency, linestrength, and self-pressure broadening coefficient, have been accurately determined by using a global fit procedure. These data are in agreement with theoretical values contained in HITRAN2016 database [I. E. Gordon et al., J. Quant. Spectrosc. Radiat. Transfer 203, 3-69 (2017)] at the same precision level. A moderate improvement of the line intensity determinations, by a factor 1.5 in the best case [P(10) transition at 5091.6 cm^-1], should be noticed, projecting direct-comb-Vernier-spectroscopy as an adequate tool for spectral intensity calibration.