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Browsing Physics by Subject "absorption spectroscopy"

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    Line intensity measurements of methane’s ν3-band using a cw-OPO
    (Applied Physics B: Lasers and Optics, 2014) Zondy, Jean-Jacques; Souza, Marco Polo Moreno de; Cadoret, Malo; Jahjah, Mohammad; Nguyen, Linh; Cruz, Flavio C.
    We report on absolute line strength measurements of P(1), R(0) and R(1) singlet lines in the 3:3 μm ν3 (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.