Real-Time Surface Analysis of Individual Airborne Environmental Particles
Real-Time Surface Analysis of Individual Airborne Environmental Particles
复制标题
单个空气传播环境颗粒的实时表面分析
DOI：
10.1021/es9905849
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发表时间：
1999
影响因子：
11.4
通讯作者：
J. Michael Ramsey
中科院分区：
文献类型：
--
作者：
A. Lazar;P. Reilly;W. Whitten;J. Michael Ramsey
通常，在实时气溶胶质谱（RTAMS）中，单个空气传播颗粒被单个聚焦激光脉冲烧蚀和电离。这种技术产生的信息，允许散装表征的颗粒，但有关颗粒的表面的信息往往被掩盖或稀释的颗粒散装。在这里，我们表明，它是可能的探测个别空气中的颗粒的表面组成，通过分离的解吸和电离步骤，使用双激光实时气溶胶质谱技术（L2RTAMS）。首先，当颗粒处于离子阱中心时，使用弱准分子激光脉冲解吸颗粒表面的半挥发性组分。在短暂的延迟之后，使用另一个准分子激光脉冲将半挥发性表面组分分散在气相中，随后进行质量分析。从一个和两个激光技术的结果进行了比较，发现是互补的。发现L2RTAMS技术对多环化合物非常敏感。
Typically, in real-time aerosol mass spectrometry (RTAMS), individual airborne particles are ablated and ionized with a single focused laser pulse. This technique yields information that permits bulk characterization of the particle, but information about the particle's surface is often masked or diluted by the particle bulk. Here we show that it is possible to probe the surface composition of individual airborne particles by separating the desorption and ionization steps using a two-laser real-time aerosol mass spectrometry technique (L2RTAMS). First, a weak excimer laser pulse was used to desorb the semivolatile components of the particle surface when the particle was in the center of the ion trap. After a short delay, another excimer laser pulse was used to ionize the semivolatile surface components in the gas phase and subsequently mass analyzed. The results from the one- and two-laser techniques were compared and found to be complementary. The L2RTAMS technique was found very sensitive to polycyclic ...