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Enhanced CRDS Methods for Trace Gas Detection and Surface Analysis

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  • Chemistry
  • Physics

Abstract

Folie 1 Evanescent-wave CRDS [1] C. Fehling, G. Friedrichs, Rev. Sci. Instrum. 81, 053109 (2010) [2] I. Galli, et al., Phy. Rev. Lett. 104, 110801 (2010) [3] I. Galli, et al., Phy. Rev. Lett. 107, 270802 (2011) cw-OPO, Aculight Argos™ Model 2400 SF Organohalogen Detection • Halocarbons play an important role in atmospheric chemistry, e.g. for ozone depletion. • What is the role of the ocean for halocarbon emissions? • What are the sources of halocarbons? • How large is the variability of halocarbons emission? • What controls the distribution of Halocarbons? Problem: • Organohalogen detection is mainly based on gas chromatography techniques that require considerable calibration effort and is limited to low sampling frequencies. Sat-CRDS 0 20 40 60 80 100 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0  g / c = 0  g / c = 0.5 (low I 0 )  g / c = 0.5 (high I 0 ) " sat "  emptyI(t) / I 0 t / s  10 -3 10 -2 10 -1 10 0 f (t I   c ,  g ) Deep convection Atmospheric Circulation h n , O H at m .l if et im e s fr o m h o u rs t o m o n th s www.eiu.edu ozonewatch.gsfc.nasa.gov Phytoplankton Macro algae Brominated and iodinated halocarbons Troposphere Ozone (O3) chemistry OH/HO2, NO/NO2 -cycles Deposition of mercury Involvement in sulfur cycle Aerosol and particle formation Br (I) 15 km Tropical Tropopause Layer (TTL) Ozone (O3) depletion involving anthropogenic chlorine • Unfortunately, most of the commercially available and field-deployable CRDS instruments are limited to the most abundant trace gases such as, CO2, CH4, and N2O and operated in the near infrared

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