公开(公告)号：US20010010354A1

公开(公告)日：2001-08-02

申请号：US09805062

申请日：2001-03-14

申请人： MICROMASS LIMITED

发明人： James Speakman ,  Raymond Clive Haines ,  Patrick James Turner ,  Thomas Oliver Merren ,  Stuart Alan Jarvis

IPC分类号： H01J049/00

CPC分类号： H01J49/063 ,  H01J49/0481 ,  H01J49/105

摘要： A plasma mass spectrometer comprises a plasma torch (1) for generating ions from a sample introduced into a plasma (2), a nozzle-skimmer interface (3, 5) for transmitting said ions into a first evacuated chamber (11), ion guiding means (12), an apertured diaphragm (18) dividing said first evacuated chamber (11) from a second evacuated chamber, and an ion mass-to-charge ratio analyzer in the second chamber for producing a mass spectrum. The ion guiding means comprises a multipole rod-set (13, 14, 15), means for applying an AC voltage between rods in the set, and means (22) for introducing into said ion guiding means an inert gas selected from the group comprising helium, neon, argon, krypton, xenon and nitrogen so that the partial pressure of said inert gas inside said rod-set is at least 10null3 torr. Interfering peaks in the spectrum, such as ARnull, are thereby reduced

摘要翻译： 等离子体质谱仪包括用于从引入等离子体（2）中的样品产生离子的等离子体焰炬（1），用于将所述离子传输到第一真空室（11）中的喷嘴 - 撇渣器界面（3,5），离子导向 装置（12），在第二室中将所述第一抽真空室（11）与第二抽空室分开的有孔隔膜（18）和离子质荷比分析器产生质谱。 离子引导装置包括多极杆组（13,14,15），用于在组中的杆之间施加AC电压的装置，以及用于将所述离子引导装置引入惰性气体的装置（22），所述惰性气体选自包括 氦气，氖气，氩气，氪气，氙气和氮气，使得所述棒组件内的所述惰性气体的分压至少为10 -3乇。 从而降低光谱中的干扰峰，如AR +