A secondary ion microprobe ion trap mass spectrometer.
A secondary ion microprobe ion trap mass spectrometer.
复制标题
二次离子微探针离子阱质谱仪。
DOI：
10.1016/s1044-0305(02)00434-8
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发表时间：
2002
影响因子：
3.2
通讯作者：
Schaaff,TGregory
中科院分区：
文献类型：
--
作者：
Todd,PeterJ;Schaaff,TGregory
离子阱质量分析器已连接到有机二次离子微探针。离子阱和微探针之间可以保持>100的压差。聚焦良好的二次离子束可以穿过小直径 (2 mm) 的管，但从离子阱到微探针的气流会受到阻碍。这种压力差使微探针能够保持成像能力。离子阱和微探针数据系统通过利用在共振喷射模式下运行的离子阱的高度可重复的周期性以及市售接口卡提供的异步信号和数据采集来集成。尽管初步证据表明捕获效率较低（<1%），但获得的二次离子质谱和图像表明灵敏度提高了约 10 倍。与使用四极杆质量过滤器相比，使用离子阱进行图像数据采集进行质量分析至少需要 10 倍的时间，因为质量选择的不稳定模式用于质量分析，即离子陷阱中的质量分辨率与四极杆中的质量分辨率不连续。
An ion trap mass analyzer has been attached to an organic secondary ion microprobe. A pressure differential >100 can be maintained between the ion trap and microprobe. The well-focused secondary ion beam can transit a small (2 mm) diameter tube, but gas flow from ion trap to microprobe is impeded. This pressure differential allows the microprobe to retain imaging capability. Ion trap and microprobe data systems are integrated by taking advantage of the highly reproducible periodicity of the ion trap operating in resonant ejection mode and asynchronous signal and data acquisition afforded by commercially available interface cards. Secondary ion mass spectra and images obtained indicate an approximately 10-fold improvement in sensitivity, although preliminary evidence indicates low (<1%) trapping efficiency. Image data acquisition using the ion trap for mass analysis requires at least 10 times as much time compared to using a quadrupole mass filter because the mass-selected instability mode is used for mass analysis, i.e., mass resolution in the ion trap is not continuous as it is in the quadrupole.