title: Absolute measurements of absorption at the iodine-laser frequency in atmospheric gases.
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) x 10(-24) and (5.4 +/- 0.4) x 10(-25) cm(2), respectively. A multipass absorption cell and a Fourier-transform spectrometer were used to obtain a cyclopropane absorption cross section of (3.47 +/- 0.02) x 10(-24) cm(2) at 14 076 cm(-1) for the photoacoustic-cell calibration.
authors.affiliation: McDonnell Douglas Research Laboratories, PO Box. 516, St. Louis, Missouri 63166, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Bragg
authors.forename: S A
authors.initials: SA
authors.lastname: Lawton
authors.forename: C E
authors.initials: CE
authors.lastname: Wiswall