Absolute measurements of absorption at the iodine-laser frequency in atmospheric gases

Physics – Optics

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Absorption Cross Sections, Atmospheric Windows, Iodine Lasers, Laser Spectroscopy, Photoacoustic Spectroscopy, Atmospheric Windows, Carbon Dioxide, Cyclopropane, Fourier Transformation, Methane

Scientific paper

The absorption cross sections at the chemical-iodine-laser frequency for methane and carbon dioxide in an atmosphere of dry air were determined with a photoacoustic cell to be (8 + or - 2) x 10 to the -24 and (5.4 + or - 0.4) x 10 to the -25th sq cm, respectively. A multipass absorption cell and a Fourier-transform spectrometer were used to obtain a cyclopropane absorption cross section (3.47 + or - 0.02) x 10 to the -24th sq cm at 14 076/cm for the photoacoustic-cell calibration.

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