Quasi-simultaneous acquisition of hard electron ionization and soft single-photon ionization mass spectra during GC/MS analysis by rapid switching between both ionization methods: analytical concept, setup, and application on diesel fuel.
Quasi-simultaneous acquisition of hard electron ionization and soft single-photon ionization mass spectra during GC/MS analysis by rapid switching between both ionization methods: analytical concept, setup, and application on diesel fuel.
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DOI：
10.1021/ac200356t
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发表时间：
2011-04
影响因子：
7.4
通讯作者：
M. Eschner;T. Gröger;T. Horvath;M. Gonin;R. Zimmermann
中科院分区：
文献类型：
--
作者：
M. Eschner;T. Gröger;T. Horvath;M. Gonin;R. Zimmermann
介绍了一种紧凑型正交加速飞行时间质谱仪中硬电子电离（EI）和软单光子电离（SPI）之间快速切换的实现。采用新型的电子束泵浦氩气激发的稀有气体准分子光源（EBEL），发射出9.8eV（126nm）的真空紫外光子，通过椭圆镜聚焦到电离室中，实现了SPI。首次将这种新型的具有切换功能的正交加速飞行时间质谱仪与一维气相色谱（GC）和二维气相色谱（GC × GC）联用。在该示范研究中，应用80 Hz的最大开关频率对矿物油型柴油样品进行研究。这种方法允许在一次分析中准同时获得关于化合物的断裂模式（EI）和分子量（SPI）的互补信息。此外，通过应用极性GC柱进行分离，SPI数据可以显示在二维等高线图中，从而实现全面的二维表征（GC × MS），同时也满足柴油的典型基团类型分配。
This work describes the realization of rapid switching between hard electron ionization (EI) and soft single-photon ionization (SPI) integrated in a compact orthogonal acceleration time-of-flight mass spectrometer. Vacuum-ultraviolet (VUV) photons of 9.8 eV (126 nm) emitted from the innovative electron-beam-pumped rare-gas excimer light source (EBEL) filled with argon are focused into the ion chamber by an ellipsoidal mirror optic for accomplishing of SPI. This novel orthogonal acceleration time-of-flight mass spectrometer with switching capability was hyphenated to one-dimensional gas chromatography (GC) and comprehensive two-dimensional (2D) gas chromatography (GC × GC) for the first time. Within this demonstration study, a maximum switching frequency of 80 Hz was applied for investigation of a mineral-oil-type diesel sample. This approach allows the quasi-simultaneous acquisition of complementary information about the fragmentation pattern (EI) as well as the molecular mass (SPI) of compounds within a single analysis. Furthermore, by application of a polar GC column for separation, the SPI data can be displayed in a 2D contour plot, leading to a comprehensive 2D characterization (GC × MS), whereas the typical group-type assignment for diesel is also met.