A method to deconvolute experimental differential cross sections is presented. The procedure removes the effect of the angular divergence of the primary beam, the finite size of the detector, and multiple scattering. The resulting cross section is the optimal experimental result. The method also determines ε=nlQ0, the average number of times each beam particle is scattered. Here n is the number density of scattering gas, l is the length of the scattering region, and Q0 is the true absolute cross section. If the product nl is known, Q0 can be determined. Since the effect of the finite angular resolution of the apparatus has been removed, this method should yield accurate total cross sections. This, in turn, allows the differential cross section to be put on an absolute scale.