射频增强-VUV灯单光子/化学电离复合离子源研究  

Radio-frequency Enhancement Single Photoionization/Chemical Ionization Source Based on VUV Lamp

作　　者：陈平[1] 花磊[1] 谢园园[1] 蒋吉春 侯可勇[1] 李海洋[1] CHEN Ping;HUA Lei;XIE Yuan-yuan;JIANG Ji-chun;HOU Ke-yong;LI Hai-yang(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《质谱学报》2020年第2期168-174,I0007,共8页Journal of Chinese Mass Spectrometry Society

基　　金：国家自然科学基金青年项目(21605142);大连化物所科研创新基金(DICP ZZBS201801)资助。

摘　　要：微型VUV放电Kr灯因体积小巧、功耗低,适合作为现场/便携式质谱的光电离源,但是该光源存在光强弱、照射区域离子利用率低等缺点,制约了质谱的灵敏度。本工作基于射频四极杆电场聚焦离子传输的原理,发展了射频增强-单光子/化学电离复合离子源技术,通过改善离子源传输效率和引入化学电离方式,进一步提高了VUV光电离源质谱的灵敏度。相比单光子电离,射频增强复合电离方式的灵敏度提高了26倍。测试结果表明,基于该复合离子源的质谱对苯、甲苯、对二甲苯的最低检出限(S/N=3)分别可达约52、53、71 ng/m^3。结果显示,射频增强-VUV灯单光子/化学电离复合离子源的体积小巧,灵敏度高,适合用作现场/便携质谱的离子源。Miniature VUV lamp is suitable for ionization source for portable mass spectrometer due to its small size and low power-consumption. However, the sensitivity based on VUV lamp is limited by low brightness and poor ion utilization in irradiation area. A radio-frequency enhancement single photoionization/chemical ionization(RF-SPI/CI) source based on VUV lamp was developed, which could increase detection sensitivity by improving ion transmission and chemical ionization methods. The sensitivity of radio-frequency enhancement ion source was 26 folds as high as that of single photoionization. The limit of detection(LOD) of benzene, toluene and p-xylene were 52, 53, 71 ng/m^3, respectively. The RF-SPI/CI source has the advantages of small size and high sensitivity, which is suitable for portable mass spectrometer.

关 键 词：单光子电离 化学电离 质谱 射频增强 离子源 

分 类 号：O657.63[理学—分析化学]