Multipass laser mass spectrometer with extreme jet-cooled pulsed gas
Multipass laser mass spectrometer with extreme jet-cooled pulsed gas
复制标题
采用极端喷射冷却脉冲气体的多通道激光质谱仪
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Yasuo Suzuki
中科院分区：
文献类型：
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作者：
Kirihara Naotoshi;Kenji Takahashi;N. Kitada;Tanaka Mizuho;Yasuo Suzuki
我们已经开发了一种光子积累激光质谱仪，使我们能够识别多氯二苯并二恶英和多氯二苯并呋喃的异构体。该系统由高温（230°C）脉冲气体注射器（PGI）、多镜多路系统（MMS）和常规飞行时间质谱仪组成。PGI诱导形成扼流超音速射流气体脉冲，该脉冲冷却到抑制碎裂的温度并减少振动和旋转热噪声。结果表明，这些物种的激发寿命数和碎片动力学的变化完全与射流冷却的分子。MMS通过延长照射持续时间（至约40 ns）和体积通过光子累积来增强软电离效率（在单路径系统上为1000倍），并且通过仔细控制电离体积内的激光强度分布来进一步最小化碎片。对于典型的异构体2，3，4，7，8-penta.
We have developed a photon accumulated laser mass spectrometer that enables us to identify isomers of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran. This system is comprised of a high temperature (230°C) pulsed gas injector (PGI), multimirror multipath system (MMS), and the conventional time-of-flight mass spectrometer. The PGI induces the formation of a choked supersonic jet gas pulse that cools down to a temperature to restrain fragmentation and reduces vibrational and rotational thermal noises. The results suggest that the excited lifetime numbers and fragment dynamics of these species change completely with jet cooling of molecules. The MMS enhances the soft ionization efficiency (by a factor of 1000 over a single path system) through photon accumulation by extending the irradiation duration (to about 40ns) and volume, and it further minimizes fragmentation by carefully controlling the laser intensity distribution within the ionization volume. For the typical isomer 2,3,4,7,8-penta...