Volume 137, 2008
From the journal:

Faraday Discussions

Metastable nitric acidhydrates—possible constituents of polar stratospheric clouds?

Hinrich Grothe,*a   Heinz Tizek†a  and  Ismael K. Ortegab  

* Corresponding authors

a Vienna University of Technology, Institute of Materials Chemistry, Veterinärplatz 1/GA, Vienna, Austria
E-mail: grothe@tuwien.ac.at
Fax: +431 25077 3890
Tel: +431 25077 3809

b Department of Molecular Physics, Instituto de Estructura de la Materia, CSIC, C/ Serrano 121, Madrid, Spain
E-mail: ikortega@iem.cfmac.csic.es
Fax: +34 915855184
Tel: +34 915901609

Abstract

Crystallization kinetics of the metastable modifications of Nitric Acid Dihydrate (NAD) was investigated by time-dependent X-Ray Diffraction (XRD) measurements. Kinetic conversion curves were evaluated adopting the Avrami model. The growth and morphology of the respective crystallites and particles were monitored in situ on the cryo-stage of an Environmental Scanning Electron Microscope (ESEM) under a partial pressure of nitrogen gas (0.5 Torr, 67 Pa). The morphologies were used to adapt the InfraRed (IR) extinction spectra by T-matrix calculation using respective optical indices of NAD. The results show a significant dependence of the band shapes on different morphologies.

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Article information

DOI
https://doi.org/10.1039/B702343J
Article type
Paper
Submitted
14 Feb 2007
Accepted
23 Apr 2007
First published
23 Jul 2007

Faraday Discuss., 2008,137, 223-234

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Metastable nitric acid hydrates—possible constituents of polar stratospheric clouds?

H. Grothe, H. Tizek and I. K. Ortega, Faraday Discuss., 2008, 137, 223 DOI: 10.1039/B702343J

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