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000046353 084__ $$2WoS$$aChemistry, Physical
000046353 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000046353 1001_ $$0P:(DE-HGF)0$$aWagner, R.$$b0
000046353 245__ $$aAerosol chamber study of optical constants and N2O5 uptake on supercooled H2SO4/H2O/HNO3 solution droplets at polar stratospheric cloud temperatures
000046353 260__ $$aWashington, DC$$bSoc.$$c2005
000046353 300__ $$a8140 - 8148
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000046353 440_0 $$03693$$aJournal of Physical Chemistry A$$v109$$x1089-5639$$y36
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000046353 520__ $$aThe mechanism of the formation of supercooled ternary H(2)SO(4)/H(2)O/HNO(3) solution (STS) droplets in the polar winter stratosphere, i.e., the uptake of nitric acid and water onto background sulfate aerosols at T < 195 K, was successfully mimicked during a simulation experiment at the large coolable aerosol chamber AIDA of Forschungszentrum Karlsruhe. Supercooled sulfuric acid droplets, acting as background aerosol, were added to the cooled AIDA vessel at T = 193.6 K, followed by the addition of ozone and nitrogen dioxide. N(2)O(5), the product of the gas phase reaction between O(3) and NO(2), was then hydrolyzed in the liquid phase with an uptake coefficient gamma(N(2)O(5)). From this experiment, a series of FTIR extinction spectra of STS droplets was obtained, covering a broad range of different STS compositions. This infrared spectra sequence was used for a quantitative test of the accuracy of published infrared optical constants for STS aerosols, needed, for example, as input in remote sensing applications. The present findings indicate that the implementation of a mixing rule approach, i.e., calculating the refractive indices of ternary H(2)SO(4)/H(2)O/HNO(3) solution droplets based on accurate reference data sets for the two binary H(2)SO(4)/H(2)O and HNO(3)/H(2)O systems, is justified. Additional model calculations revealed that the uptake coefficient gamma(N(2)O(5)) on STS aerosols strongly decreases with increasing nitrate concentration in the particles, demonstrating that this so-called nitrate effect, already well-established from uptake experiments conducted at room temperature, is also dominant at stratospheric temperatures.
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000046353 7001_ $$0P:(DE-HGF)0$$aNaumann, K.-H.$$b1
000046353 7001_ $$0P:(DE-Juel1)VDB13551$$aMangold, A.$$b2$$uFZJ
000046353 7001_ $$0P:(DE-HGF)0$$aMöhler, O.$$b3
000046353 7001_ $$0P:(DE-HGF)0$$aSaathoff, H.$$b4
000046353 7001_ $$0P:(DE-HGF)0$$aSchurath, U.$$b5
000046353 773__ $$0PERI:(DE-600)2006031-2$$a10.1021/jp0513364$$gVol. 109, p. 8140 - 8148$$p8140 - 8148$$q109<8140 - 8148$$tThe @journal of physical chemistry <Washington, DC> / A$$v109$$x1089-5639$$y2005
000046353 8567_ $$uhttp://hdl.handle.net/2128/744$$uhttp://dx.doi.org/10.1021/jp0513364
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