Li Gang, Li Detian, Cheng Yongjun, Sun Wenjun, Pei Xiaoqiang, Han Xiaodong, Zhang Huzhong, Wang Yongjun, Sun Jian, Dong Meng
Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou, China.
Eur J Mass Spectrom (Chichester). 2018 Aug;24(4):322-329. doi: 10.1177/1469066718776441. Epub 2018 May 14.
A miniaturized linear ion trap mass spectrometer with continuous atmospheric pressure interface has been built in our lab. Significant extension in mass range and reduction in power consumption have been realized by the supplemental alternating current frequency scan mode. However, relatively poor sensitivity has been witnessed, which is directly dominated by the detection efficiency of the ion detector. Theoretical analysis has been implemented to find ways to improve the detection efficiency. The results show that enhanced sensitivity can be obtained by applying a direct current voltage on the pair of electrodes in eject direction. Experiments show that the sensitivity has been improved by more than one time due to the application of direct current voltage. With this design, this homemade miniature linear ion trap mass spectrometer can be used to analyze more rarefied samples, especially to on-site chemical analysis and space application.
我们实验室构建了一台具有连续大气压接口的小型线性离子阱质谱仪。通过补充交流频率扫描模式实现了质量范围的显著扩展和功耗的降低。然而，已观察到灵敏度相对较差，这直接由离子探测器的检测效率决定。已进行理论分析以寻找提高检测效率的方法。结果表明，通过在引出方向的一对电极上施加直流电压可获得更高的灵敏度。实验表明，由于施加了直流电压，灵敏度提高了一倍以上。采用这种设计，这种自制的微型线性离子阱质谱仪可用于分析更稀薄的样品，尤其适用于现场化学分析和空间应用。
