High accuracy line positions of the ν 1 fundamental band of 14 N 2 16 O

Bidoor Alsaif, Marco Lamperti, Davide Gatti, Paolo Laporta, Martin Fermann, Aamir Farooq, Oleg Lyulin, Alain Campargue, Marco Marangoni

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6 Scopus citations


The ν1 fundamental band of N2O is examined by a novel spectrometer that relies on the frequency locking of an external-cavity quantum cascade laser around 7.8 μm to a near-infrared Tm:based frequency comb at 1.9 μm. Due to the large tunability, nearly 70 lines in the 1240 – 1310 cm−1 range of the ν1 band of N2O, from P(40) to R(31), are for the first time measured with an absolute frequency calibration and an uncertainty from 62 to 180 kHz, depending on the line. Accurate values of the spectroscopic constants of the upper state are derived from a fit of the line centers (rms ≈ 4.8 × 10−6 cm−1 or 144 kHz). The ν1 transitions presently measured in a Doppler regime validate high accuracy predictions based on sub-Doppler measurements of the ν3 and ν3-ν1 transitions.
Original languageEnglish (US)
Pages (from-to)172-178
Number of pages7
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
StatePublished - Mar 8 2018


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