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H2O and Hcl Trace Gas Kinetics on Crystalline and Amorphous Hcl Hydrates in the Range 170 to 205 K: the Hcl/H2O Phase Diagram Revisited : Volume 13, Issue 11 (27/11/2013)

By Iannarelli, R.

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Book Id: WPLBN0003996541
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File Size: Pages 75
Reproduction Date: 2015

Title: H2O and Hcl Trace Gas Kinetics on Crystalline and Amorphous Hcl Hydrates in the Range 170 to 205 K: the Hcl/H2O Phase Diagram Revisited : Volume 13, Issue 11 (27/11/2013)  
Author: Iannarelli, R.
Volume: Vol. 13, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Iannarelli, R., & Rossi, M. J. (2013). H2O and Hcl Trace Gas Kinetics on Crystalline and Amorphous Hcl Hydrates in the Range 170 to 205 K: the Hcl/H2O Phase Diagram Revisited : Volume 13, Issue 11 (27/11/2013). Retrieved from

Description: Laboratory of Atmospheric Chemistry (LAC), Paul Scherrer Institute (PSI), PSI Villigen, 5232, Switzerland. In this laboratory study, H2O ice films of 1 to 2 Μm thickness have been used as surrogates for ice particles at atmospherically relevant conditions in a stirred flow reactor (SFR) to measure the kinetics of evaporation and condensation of HCl and H2O on crystalline and amorphous HCl hydrates. A multidiagnostic approach has been employed using FTIR absorption spectroscopy in transmission to monitor the condensed phase and residual gas mass spectrometry (MS) for the gas phase. An average mass balance ratio between HCl adsorbed onto ice and the quantity of HCl measured using FTIR absorption, (NnNescNads)/NFTIR = 1.182 ± 0.123 has been obtained. The rate of evaporation Rev(HCl) for crystalline HCl hexahydrate (HCl·6H2O) films and amorphous HCl/H2O mixtures has been found to be lower by a factor of 10 to 250 compared to Rev(H2O) in the overlapping temperature range 175 to 190 K. Variations of the accommodation coefficient Α (HCl) on pure HCl·6H2O up to a factor of 10 have been observed. The kinetic parameters are thermochemically consistent with the corresponding equilibrium vapour pressure. In addition, we propose an extension of the HCl/H2O phase diagram of crystalline HCl·6H2O based on the analysis of deconvoluted FTIR spectra of samples outside its known existence area. A brief evaluation of the atmospheric importance of both condensed phases, amorphous HCl/H2O and crystalline HCl·6H2O, is performed in favour of the amorphous phase.

H2O and HCl trace gas kinetics on crystalline and amorphous HCl hydrates in the range 170 to 205 K: the HCl/H2O phase diagram revisited

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