Gadermann Moritz, Vollmar Daniel, Signorell Ruth
Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, V6T 1Z1, BC, Canada.
Phys Chem Chem Phys. 2007 Aug 28;9(32):4535-44. doi: 10.1039/b704600f. Epub 2007 Jun 29.
Acetic acid aerosol particles, formic acid aerosol particles and mixed acid/ice particles were generated in a collisional cooling cell at a temperature of 78 K and investigated using in situ rapid scan Fourier transform infrared spectroscopy. The infrared spectra reveal that the internal structure of the particles critically depends on the particle formation conditions and, especially for the mixed particles, on the composition. The acetic acid particles are likely to have only a partially crystalline structure whereas the formic acid particles are likely to have an overall crystalline structure. The existence of acid in the mixed acid/ice particles prevents the ice from crystallization even at low acid concentrations (less than 10%). Mid-infrared refractive index data were derived from the different particle spectra, which can be helpful for remote sensing of such systems.
在温度为78 K的碰撞冷却池中生成了乙酸气溶胶颗粒、甲酸气溶胶颗粒以及混合酸/冰颗粒，并使用原位快速扫描傅里叶变换红外光谱对其进行了研究。红外光谱表明，颗粒的内部结构主要取决于颗粒的形成条件，特别是对于混合颗粒，还取决于其组成。乙酸颗粒可能仅具有部分结晶结构，而甲酸颗粒可能具有整体结晶结构。即使在低酸浓度（小于10%）下，混合酸/冰颗粒中酸的存在也会阻止冰结晶。从不同颗粒光谱中得出了中红外折射率数据，这有助于对此类系统进行遥感探测。
