Absorption cross-sections and pressure broadening of rotational lines in the ν5 + ν9 band of ethene measured by diode laser cavity ring down spectroscopy

Literature Information

Publication Date 2004-10-14
DOI 10.1039/B413238F
Impact Factor 3.676
Authors

Alistair M. Parkes, Ruth E. Lindley, Andrew J. Orr-Ewing


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Abstract

Absorption cross sections are reported for several rotationally resolved lines in the QQ-branch of the ν5 + ν9 combination vibrational band of ethene (ethylene) at wavelengths around 1.625 μm. The measurements were made using cavity ring-down spectroscopy with a near infra-red diode laser. In the strongest region of the band, a line-integrated absorption cross section for the QQ4(4) feature of 5.08 ± 0.38 × 10−22 cm2 molecule−1 cm−1 is obtained, with a peak cross section at line centre of 3.23 ± 0.03 × 10−20 cm2 molecule−1. The effects of addition of pressures of up to 200 Torr of air on spectral linewidths are analysed to obtain an air broadening coefficient (HWHM) of γ = 0.1060 ± 0.0011 cm−1 atm−1. In 1 atm of air, the line centre absorption cross sections in the QQ4 branch are reduced by a factor of ∼8 because of line broadening. The consequences of these data for direct monitoring of ethene in the atmosphere using sensors based on diode laser cavity ring-down spectroscopy are discussed.

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Physical Chemistry Chemical Physics
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