Abstract
In the first direct application of the electron-photon coincidence technique for differential cross-section measurements, experimentally determined ratios of the differential cross sections for the electron impact excitation of the $1^{1}S\ensuremath{\rightarrow}2^{1}P$ to the $1^{1}S\ensuremath{\rightarrow}3^{1}P$ transitions are presented at 30 and 40 eV incident electron energies. Differential cross sections for the $1^{1}S\ensuremath{\rightarrow}3^{1}P$ transitions are derived by normalizing these ratios to available experimental differential cross sections for the $1^{1}S\ensuremath{\rightarrow}2^{1}P$ transition.
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