Abstract

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 ± 2) × 10⁻²⁴ and (5.4 ± 0.4) × 10⁻²⁵ cm², respectively. A multipass absorption cell and a Fourier-transform spectrometer were used to obtain a cyclopropane absorption cross section of (3.47 ± 0.02) × 10⁻²⁴ cm² at 14 076 cm⁻¹ for the photoacoustic-cell calibration.

© 1985 Optical Society of America

Atmospheric water vapor absorption at 1.3 μm

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