On the temporal aberration theory of electron optical imaging systems by Tau-variation method

By the use of a definition of temporal aberrations, the temporal aberration theory of electron optical imaging system was again investigated by the 'Tau-variationm method'. Results show that the expressions in integral form can also be obtained by the 'Tau-variation method' which usually needs to solve the differential equations for the three of geometrical temporal aberration coefficients of second order. It also proves that the 'direct integral method' and 'Tau-variation method' reach the same goal by different ways.