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.