电子轰击型离子源中抑制H_3^+的几点思考

Several Ideas of Restraining H_3^+ in EI Ion Source

分析了在电子轰击型(EI)离子源中,磁场、进样量、阴极电流和阴极电压等4种主要仪器设备条件对产生H3+的影响,在实验中得到较好的验证,并得到H3+在4种条件下的基本影响趋势。本研究对使用低分辨率质谱计分析天然氢同位素时,EI离子源参数的调节和进样量的选取具有指导意义。

The influence on the production of H3＋ was analyzed under four main conditions： magnetic field,inlet sample quantity,cathode current and cathode voltage.The analysis result was well validated by experiment data.The basic influence trend of producing H3＋ was got under four conditions.The conclusions were instructive to adjust the parameters of EI ion source and sampling quantity in analyzing natural hydrogen isotope by using low resolution mass spectrometer.