Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections
Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections
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DOI：
10.1063/1.4733987
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发表时间：
2012-07-21
影响因子：
4.4
通讯作者：
Fedor, J.
中科院分区：
文献类型：
--
作者：
Lengyel, J.;Kocisek, J.;Fedor, J.
研究了游离冰纳米粒子对几种大气分子的吸收。选择的典型例子有：水、甲烷、氮氧化物（NO、NO2）、卤化氢（HCl、HBr）和挥发性有机化合物（CH3OH、CH3CH2OH）。在分子束实验中测量了冰纳米颗粒 (H2O)(N) 上这些分子的拾取横截面，平均尺寸 (N) 超过棒约 260（直径类似于 2.3 nm）。这些横截面是根据拾取过程中动量传递导致的簇束速度降低确定的。对于水分子，进行分子动力学模拟以了解拾取过程的细节。水的实验结果与模拟结果非常吻合。直径为几纳米的冰颗粒的拾取横截面可以比这些颗粒的几何横截面大3倍以上。这可能会对大气冰纳米颗粒的建模产生重大影响，例如它们的生长。 (C) 2012 年美国物理研究所。 [http://dx.doi.org/10.1063/1.4733987]
Uptake of several atmospheric molecules on free ice nanoparticles was investigated. Typical examples were chosen: water, methane, NOx species (NO, NO2), hydrogen halides (HCl, HBr), and volatile organic compounds (CH3OH, CH3CH2OH). The cross sections for pickup of these molecules on ice nanoparticles (H2O)(N) with the mean size of (N) over bar approximate to 260 (diameter similar to 2.3 nm) were measured in a molecular beam experiment. These cross sections were determined from the cluster beam velocity decrease due to the momentum transfer during the pickup process. For water molecules molecular dynamics simulations were performed to learn the details of the pickup process. The experimental results for water are in good agreement with the simulations. The pickup cross sections of ice particles of several nanometers in diameter can be more than 3 times larger than the geometrical cross sections of these particles. This can have significant consequences in modelling of atmospheric ice nanoparticles, e.g., their growth. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4733987]