Abstract
The absorption spectrum of α-pinene gas, a biogenic
volatile organic compound, was directly measured with a pulsed
mid-infrared laser. The maximum absorption wavelength was found to
be ∼3.42 µm, and an absorption cross section of 4.8 ×
10-23 m2 molec-1 was
obtained. A simple theoretical calculation with the measured
spectral data showed that several hundreds of parts in 1012
(ppt) of α-pinene gas in forest–mountain areas over a range of
∼10 km were detectable by a long-path-averaged hard-target absorption
lidar. Requirements for system development were also
discussed.
© 2001 Optical Society of America
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