Line intensity measurements of methane’s ν3-band using a cw-OPO

Jean-Jacques Zondy, Marco Polo Moreno de Souza, Malo Cadoret, Mohammad Jahjah, Linh Nguyen, Flavio C. Cruz

Research output: Contribution to journalArticlepeer-review


We report on absolute line strength measurements of P(1), R(0) and R(1) singlet lines in the 3:3 μm ν(C–H stretching) band of methane 12CH4 at referencetemperature T = 296 K. Line strength measurements are performed at low pressure (P <1 Torr) using direct absorption spectroscopy technique based on a widely tunable continuous-wave singly resonant optical parametric oscillator. The 1σ 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.
Original languageEnglish
Pages (from-to)681–687
JournalApplied Physics B: Lasers and Optics
Publication statusPublished - 2014

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