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
Original Manuscript: August 9, 2000
Revised Manuscript: January 22, 2001
Published: July 20, 2001
Yasunori Saito, Petter Weibring, Hans Edner, and Sune Svanberg, "Possibility of hard-target lidar detection of a biogenic volatile organic compound, α-pinene gas, over forest areas," Appl. Opt. 40, 3572-3574 (2001)