MASS-MOBILITY CORRELATION OF IONS IN VIEW OF NEW MOBILITY DATA
MASS-MOBILITY CORRELATION OF IONS IN VIEW OF NEW MOBILITY DATA
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DOI：
10.1021/ja00193a010
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发表时间：
1989-05-24
影响因子：
15
通讯作者：
KARPAS, Z
中科院分区：
文献类型：
--
作者：
BERANT, Z;KARPAS, Z
通过离子迁移谱（IMS）技术测定了在脂肪胺、芳香胺和乙酰基中形成的主要离子的降低的迁移率。在低E/N条件下，获得了大量的多原子离子在空气和氦气中的迁移率数据，使我们对理论与实验的一致性有了新的认识。基于刚性球或极化极限近似的模型不能正确地表示离子和漂移气体分子之间的相互作用。使用梅森的模型与硬核电位定性再现实验数据，虽然定量协议在广泛的离子质量，特别是在氦，只是公平的。通过在碰撞截面项中引入一个经验质量相关的修正项，对模型稍作修改，获得了更好的定量一致性。这是通过相互作用势中最小值的位置的表达式rm\rm=（r 0 + zm）[1+（nr/M）1/3]来完成的，其中z是校正项。
The reduced mobility of the major ion formed in aliphatic amines, aromatic amines, and acetyls was determined by ion mobility spectrometry (IMS) techniques. This acquisitionof a large amount of data on the mobility of polyatomic ions inair and helium, under low E/N conditions, enabled us to take a fresh view on the agreement between theory and experiment. Models based on the rigid sphere or the polarization limit approximations do not properly represent the interaction between the ion and drift gas molecules. Use of Mason’s model with a hard-core potential qualitatively reproduced experimental data, although quantitative agreement over a broad range of ion masses, especially in helium, was only fair. Better quantitative agreement was obtained when the model was slightly modified, by introduction of an empirical mass-dependent correction term in the collision cross-section term. This was done through the expression for the position of the minimum in the interaction potential, rm\rm=(r0+ zm)[1+(nr/M) 1/3], where z is the correction term.