分子束中冰纳米粒子的大气过程。

Atmospheric processes on ice nanoparticles in molecular beams.

机构信息

Laboratory of Molecular and Cluster Dynamics, Department of Ion and Cluster Chemistry, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic Prague, Czech Republic.

出版信息

Front Chem. 2014 Feb 24;2:4. doi: 10.3389/fchem.2014.00004. eCollection 2014.

DOI:10.3389/fchem.2014.00004

PMID:24790973

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3982562/

Abstract

THIS REVIEW SUMMARIZES SOME RECENT EXPERIMENTS WITH ICE NANOPARTICLES (LARGE WATER CLUSTERS) IN MOLECULAR BEAMS AND OUTLINES THEIR ATMOSPHERIC RELEVANCE: (1) Investigation of mixed water-nitric acid particles by means of the electron ionization and sodium doping combined with photoionization revealed the prominent role of HNO3 molecule as the condensation nuclei. (2) The uptake of atmospheric molecules by water ice nanoparticles has been studied, and the pickup cross sections for some molecules exceed significantly the geometrical sizes of the ice nanoparticles. (3) Photodissociation of hydrogen halides on water ice particles has been shown to proceed via excitation of acidically dissociated ion pair and subsequent biradical generation and H3O dissociation. The photodissociation of CF2Cl2 molecules in clusters is also mentioned. Possible atmospheric consequences of all these results are briefly discussed.

摘要

本文总结了分子束中冰纳米粒子（大水簇）的一些最新实验，并概述了其大气相关性：（1）通过电子电离和钠掺杂结合光致电离的方法研究了混合水-硝酸粒子，揭示了 HNO3 分子作为凝结核的突出作用。（2）研究了大气分子在水冰纳米粒子上的吸收，一些分子的吸收截面明显超过冰纳米粒子的几何尺寸。（3）已经表明，氢卤化物在水冰颗粒上的光解通过酸性解离的离子对的激发以及随后的双自由基生成和 H3O 解离进行。还提到了 CF2Cl2 分子在团簇中的光解。简要讨论了所有这些结果的可能的大气后果。