Development and Characterization of a Laser-Induced Acoustic Desorption Source
Development and Characterization of a Laser-Induced Acoustic Desorption Source
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DOI：
10.1021/acs.analchem.7b04797
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发表时间：
2018-03-20
影响因子：
7.4
通讯作者：
Kuepper, Jochen
中科院分区：
文献类型：
--
作者：
Huang, Zhipeng;Ossenbrueggen, Tim;Kuepper, Jochen
本文介绍了一种用于自由电子激光器等中心设备的激光诱导声解吸源。它具有延长的测量时间和固定的交互点。一种新颖的样品沉积方法，使用气溶胶喷雾提供了一个均匀的样品覆盖，因此稳定的信号强度。利用强场电离作为一种通用的检测方案，所产生的分子羽流的数量密度，空间扩展，破碎，时间分布，平移速度，和平移温度的条款进行了表征。解吸激光强度对这些羽流特性的影响进行了评估。虽然平移速度是不变的不同的解吸激光强度，指向一个非热解吸机制，平移温度显着增加，并观察到更高的碎片与解吸激光能量密度。
A laser-induced acoustic desorption source, developed for use at central facilities, such as free-electron lasers, is presented. It features prolonged measurement times and a fixed interaction point. A novel sample deposition method using aerosol spraying provides a uniform sample coverage and hence stable signal intensity. Utilizing strong-field ionization as a universal detection scheme, the produced molecular plume is characterized in terms of number density, spatial extend, fragmentation, temporal distribution, translational velocity, and translational temperature. The effect of desorption laser intensity on these plume properties is evaluated. While translational velocity is invariant for different desorption laser intensities, pointing to a nonthermal desorption mechanism, the translational temperature increases significantly and higher fragmentation is observed with increased desorption laser fluence.