Abstract
A new formula to calculate integral excitation cross sections at small scattering angles has been derived using the recently developed universal function. The Xe 5p6(1S)→5p5(2P3/2)6s transition is used to demonstrate the importance of small angle contribution to the integral cross sections. Additionally, measurements of differential cross sections for the resonance transition in Na are contrasted at 54.4 eV. The results show that a correct asymptotic form and an accurate total excitation cross section can be obtained by normalizing the measurement to the universal function.
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