Ionization efficiency of evolved gas molecules from aerosol particles in a thermal desorption aerosol mass spectrometer: Laboratory experiments
Ionization efficiency of evolved gas molecules from aerosol particles in a thermal desorption aerosol mass spectrometer: Laboratory experiments
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热解吸气溶胶质谱仪中气溶胶颗粒逸出气体分子的电离效率：实验室实验
DOI：
10.1080/02786826.2018.1544704
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发表时间：
2019
影响因子：
5.2
通讯作者：
and Nobuyuki Takegawa
中科院分区：
文献类型：
--
作者：
Kento Uchida;Yu Ide;and Nobuyuki Takegawa
电子电离热解吸气溶胶质谱仪（TDAMSs）被广泛用于气溶胶化学成分的定量分析，而气溶胶粒子释放气体分子的电离效率是进行气溶胶化学成分定量分析的重要参数。我们使用定制的tdam进行了实验室实验，以研究影响电离效率的关键因素。选用氯化铵（NH4Cl）和碘化铵（NH4I）作为试验化合物，因为它们的热分解产物比较简单（以氨（NH3）和卤化氢（HX）为主）。通过改变电离器相对于汽化点的位置来测量来自nh3和HX的离子信号。nh3离子信号与HX离子信号的比值随着演化气体羽流发散角的增大而增大，表明气体分子的角度分布可能是影响电离效率的重要因素。版权所有©2018美国气溶胶研究协会
Thermal desorption aerosol mass spectrometers (TDAMSs) with electron ionization are widely used for quantitative analysis of aerosol chemical composition, and the ionization efficiency of evolved gas molecules from aerosol particles is an important parameter for such analysis. We performed laboratory experiments using a custom-made TDAMS to investigate the key factors affecting ionization efficiency. Ammonium chloride (NH4Cl) and ammonium iodide (NH4I) were used as test compounds because their thermal decomposition products are expected to be simple (dominated by ammonia (NH3) and hydrogen halide (HX)). The ion signals originating from NH3and HX were measured by altering the position of the ionizer relative to the vaporization point. The ratio of ion signal from NH3to that from HX increased with increasing divergence angle of evolved gas plumes, which suggests that the angular distribution of gas molecules could be an important factor affecting the ionization efficiency.Copyright © 2018 American Association for Aerosol Research