基于数值解分析非均匀电场对离子迁移谱的影响

本研究分析了迁移管内带电体的结构，给出求解拉普拉斯方程的数学模型、迁移管带电体的边界处理方法和迁移管内离散电场数值的计算方法。离子门关闭期间，改变驱动脉冲的对称电压值将在迁移区产生非均匀电场，对离子迁移谱的分辨率、峰位、信噪比等特性产生影响。借助数值求解拉普拉斯方程得到的计算结果，对非均匀电场对迁移谱的影响进行合理的解释，给出理论计算迁移谱峰位的方法，并与实验结果进行比较，验证了计算方法的可靠性。实验结果表明，应用离散求解拉普拉斯方程计算迁移管电场在离子迁移谱领域有较好的应用前景。

Based on Numeric Solution Analysis of the Effect of Non-Uniform Electric Field to Ion Mobility Spectrometry

First, the structure of charged conducts in ion mobility spectrometry (IMS) was analyzed and the mathematical modal of Laplace equation was given. Then the boundary process and the method of discrete electric field calculating of drift tube were given. Due to the non-uniform electric field produced by asymmetric power to ion shutter, the resolution, peak position and SNR of IMS was affected. Aimed by the result of numeric solution to Laplace equation, rational explanation was given for the effect of non-uniform to IMS. Theoretic calculation of peak position of IMS was achieved, and compared with the experimental results, the method reliability was verified. The experimental result proves that discrete solution to Laplace equation for calculate electric field in drift tube has good application prospect in the field of ion mobility spectrometry.