Applied Physics B

, Volume 117, Issue 2, pp 681–687 | Cite as

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

  • Marco P. Moreno
  • Malo Cadoret
  • Mohammad Jahjah
  • Linh Nguyen
  • Flavio C. Cruz
  • Jean-Jacques Zondy


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.


Optical Parametric Oscillator Line Strength Free Spectral Range Idle Power Idle Beam 
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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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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Marco P. Moreno
    • 1
    • 2
  • Malo Cadoret
    • 1
  • Mohammad Jahjah
    • 1
  • Linh Nguyen
    • 1
  • Flavio C. Cruz
    • 3
  • Jean-Jacques Zondy
    • 1
  1. 1.Laboratoire Commun de Métrologie LNE-CnamLa Plaine Saint DenisFrance
  2. 2.Departamento de FísicaUniversidade Federal de RondôniaCampus Ji-ParanáBrazil
  3. 3.Instituto de Física Gleb WataghinUniversidade Estadual de CampinasCampinasBrazil

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