The heterogeneous reaction of N2O5 with airborne illite and Arizona test dust (ATD) particles was investigated at room temperature and at different relative humidities using an atmospheric pressure aerosol flow tube. N2O5 at concentrations in the range 8 to 24 × 1012 molecule cm?3 was monitored using thermal-dissociation cavity ring-down spectroscopy at 662 nm. At zero relative humidity a large uptake coefficient of N2O5 to illite was obtained, γ(N2O5) = 0.09, which decreased to 0.04 as relative humidity was increased to 67%. In contrast, the uptake coefficient derived for ATD is much lower (~0.006) and displays a weaker (if any) dependence on relative humidity (0–67%). Potential explanations are given for the significant differences between the uptake behaviour for ATD and illite and the results are compared with uptake coefficients for N2O5 on other mineral surfaces.
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机译：使用大气压气溶胶流量管在室温和不同的相对湿度下研究N2O5与空气中的伊尔石和亚利桑那州试验粉尘（ATD）颗粒的异质反应。在8至24×1012分子Cm = 3的浓度下，使用热解离腔循环光谱在662nm处监测N 2 O 5。在零相对湿度下，获得N 2 O 5的大量摄取系数，γ（N2O5）= 0.09，其降低至0.04，随着相对湿度增加到67％。相反，导出的用于ATD的摄取系数远低得多（〜0.006），并显示对相对湿度（0-67％）的较弱（如果有）依赖性。给出了ATD和Imlite的摄取行为之间的显着差异，并将结果与其他矿物表面上的N2O5的摄取系数进行了比较。
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