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作低丰度 D 样品同位素质谱分析时,为了提高测量数据的精确度,须测量质量数为[2]和[3]的离子流,但在[3]的谱峰上叠加着[HD]~+和[H_3]~+两种离子成份,[H_3]~+系由分子-离子碰撞作用生成的:H_2~++H_2→H_3~++H产生 H_3~+的多少,与离子源里的气体压力有关,即第二次碰撞离子数量与气体压力的平方成正比关系。因此,在实验中须力求减少气
For low-abundance D sample isotope mass spectrometry analysis, in order to improve the accuracy of the measurement data, ion fluxes of masses [2] and [3] must be measured, but [HD] ~ H_3 ~ + H_3 ~ + H_3 ~ + H_3 ~ + H_3 ~ + H_3 ~ + H_3 ~ + H_3 + Gas pressure, that is, the second collision ion quantity is proportional to the square of gas pressure. Therefore, in the experiment must strive to reduce the gas