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. 2018 Jan 22;8:1292. doi: 10.1038/s41598-018-19188-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Absorption spectrum at 298 K of a 85% air-diluted N₂O sample at a pressure of 0.25 mbar near 1269 cm⁻¹, with a comb-defined frequency axis. Inset: zoomed-in view of the P(25) doublet, with interleaved spectra for a denser spectral sampling. (b) Absorption spectrum of the P(18) line of N₂O with a 0.07% dilution at 131 mbar with a 100-MHz frequency grid (bottom panel) and residuals from a Voigt fitting (top panel). (c) Absorption spectrum of the same line in a pure sample at 0.013 mbar (bottom panel), and residuals from a Gaussian fitting (top panel). The spectrum is in this case acquired by a 4 Hz stepping of the comb repetition frequency (1.5 MHz spaced optical frequency grid). In the figure, χ is the dilution factor.