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Line intensity measurements of methane’s \(\nu _3\)-band using a cw-OPO

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Abstract

We report on absolute line strength measurements of P(1), R(0) and R(1) singlet lines in the \(3.3\,\upmu\hbox {m}\,\nu _{3}\) (C–H stretching) band of methane \(^{12}\hbox {CH}_4\) at reference temperature \(T=296\) K. Line strength measurements are performed at low pressure \((P \le 1\hbox { Torr})\) using direct absorption spectroscopy technique based on a widely tunable continuous-wave singly resonant optical parametric oscillator. The \(1\sigma \) overall accuracy in line strength determinations ranges between 7 and 8 % mostly limited by pressure and frequency measurements. A comparison with previous reported values is made. Our results show good agreement with the HITRAN 2012 database.

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Acknowledgments

The authors acknowledge partial support from a FP7- EURAMET grant (contract No ENV-06). M. P. Moreno thanks CAPES for postdoctoral fellowship support under BEX-12610-12-7. The authors thank PHC-Capes Cofecub program (project code: 25060RE) for support.

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Authors and Affiliations

  1. Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy, 93210 , La Plaine Saint Denis, France

    Marco P. Moreno, Malo Cadoret, Mohammad Jahjah, Linh Nguyen & Jean-Jacques Zondy

  2. Departamento de Física, Universidade Federal de Rondônia, Campus Ji-Paraná, Rondônia, 76900-726, Brazil

    Marco P. Moreno

  3. Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Campinas, SP, 13083-859, Brazil

    Flavio C. Cruz

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  1. Marco P. Moreno
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  2. Malo Cadoret
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  3. Mohammad Jahjah
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  4. Linh Nguyen
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  5. Flavio C. Cruz
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  6. Jean-Jacques Zondy
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Correspondence to Malo Cadoret.

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Moreno, M.P., Cadoret, M., Jahjah, M. et al. Line intensity measurements of methane’s \(\nu _3\)-band using a cw-OPO. Appl. Phys. B 117, 681–687 (2014). https://doi.org/10.1007/s00340-014-5883-1

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  • DOI: https://doi.org/10.1007/s00340-014-5883-1

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