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We have demonstrated airborne measurements of CO2 column absorption at 1571.4 nm from 10 km altitudes with a wavelength-scanned lidar using a pulsed diode-seeded EDFA transmitter and a photon counting receiver.
This paper discusses the use of high-precision direct absorption spectroscopy to realize the amount of substance standards for ozone (O 3), a reactive species which cannot be delivered through traditional gravimetrically based gas cylinder standards. The O3 amount of substance is linked to the known concentrations of nitric oxide (NO) and nitrogen dioxide (NO2) through a gas-phase titration reaction...
We report power, line width and mode purity for a cw 5.5 mum quantum cascade laser at -26 C. We detect atmospheric NO with high sensitivity (0.5 ppb Hz-1/2) using rapid sweep, direct absorption spectroscopy.
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