The forward glory effect in the differential cross sections measured below Elab = 50 eV for the one-electron capture process in N5+ - He collisions

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A crossed-beam apparatus was used to measure the relative state-selective differential cross sections for the one-electron capture process in the N5+?He system from θlab = ?3° to 21° at Elab = 27.5 and 47.5 eV. The main reaction channel was found to be N5+ (1s2 1S) + He → N4+ (1s23s 2S) + He+ + 16.8 eV. The differential cross section for this channel is pronounced at θcm = 0, and it shows another peak at a certain angle that depends on the collision energy. The O5+?He system at Elab = 47.5 eV was measured for comparison. The differential cross section for the main reaction channel O5+ (1s22s 2S) + He → O4+ (1s22s3p 1,3P) + He+ + 17 eV is zero at θcm = 0, and it shows only a single peak at θcm = 0.314 rad. The structures observed in the N5+?He system were analysed using the classical deflection function based on ab initio potentials. The peak observed at θcm = 0 is assigned to the forward glory effect and the second peak to the inelastic rainbow effect.

identifier:JOS-09534075-44-175202

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