High accuracy line positions of the ν1 fundamental band of 14N2 16O

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 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 ν31 transitions.

Original languageEnglish (US)
Pages (from-to)172-178
Number of pages7
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
StatePublished - May 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd


  • Frequency comb
  • Line position
  • Microwave
  • Mid-infrared
  • Nitrous oxide
  • Quantum cascade laser

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy


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