Absolute electron scattering cross sections for the 2S→2P transition in Zn+ using energy‐loss and merged‐beams methods

Using the electron energy‐loss method in a merged electron‐ion beams geometry absolute, cascade‐free excitation cross sections have been measured for the resonance 2S→2P transition in Zn+. Measurements were carried out at electron energies of below threshold (threshold at 6.011 eV) to 40 eV. Results are in very good agreement with close‐coupling calculations and, away from threshold, lie below absolute line‐emission cross sections which include effects of cascade into the 2P state from higher levels.