Metastable Nitric Acid Trihydrate in Ice Clouds

被引：11

作者：

Weiss, Fabian ^{[1
]}

Kubel, Frank ^{[2
]}

Galvez, Oscar ^{[3
]}

Hoelzel, Markus ^{[4
]}

Parker, Stewart F. ^{[5
]}

Baloh, Philipp ^{[1
]}

Iannarelli, Riccardo ^{[6
]}

Rossi, Michel J. ^{[6
]}

Grothe, Hinrich ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Mat Chem, Getreidemarkt 9-BC-01, A-1060 Vienna, Austria

[2] Vienna Univ Technol, Inst Chem Technol & Analyt, Getreidemarkt 9-BC-01, A-1060 Vienna, Austria

[3] IEM CSIC, Madrid, Spain

[4] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, D-80290 Munich, Germany

[5] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[6] Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2016年 / 55卷 / 10期

基金：

瑞士国家科学基金会;

关键词：

atmospheric chemistry; diffraction; ice clouds; polar stratospheric clouds; vibrational spectroscopy; POLAR STRATOSPHERIC CLOUDS; HOMOGENEOUS NUCLEATION; CIRRUS CLOUDS; NAT; SPECTRA; WATER; PSCS;

D O I：

10.1002/anie.201510841

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The composition of high-altitude ice clouds is still a matter of intense discussion. The constituents in question are ice and nitric acid hydrates, but the exact phase composition of clouds and its formation mechanisms are still unknown. In this work, conclusive evidence for a long-predicted phase, alpha-nitric acid trihydrate (alpha-NAT), is presented. This phase was characterized by a combination of X-ray and neutron diffraction experiments, allowing a convincing structure solution. Furthermore, vibrational spectra (infrared and inelastic neutron scattering) were recorded and compared with theoretical calculations. A strong interaction between water ice and alpha-NAT was found, which explains the experimental spectra and the phase-transition kinetics. On the basis of these results, we propose a new three-step mechanism for NAT formation in high-altitude ice clouds.

引用

页码：3276 / +

页数：5

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