Absolute, cascade-free cross sections for the2S→2Ptransition inZn+using electron-energy-loss and merged-beams methods

Absolute, cascade-free excitation cross sections in an ion have been measured for the resonance ${}_{}{}^2{}_{}{}^{}$S${\to }^2$P transition in ${\mathrm{Zn}}^{+}$ using electron-energy-loss and merged electron-ion beams methods. Measurements were carried out at electron energies of below threshold to 6 times threshold. Comparisons are made with 2-, 5-, and 15-state close-coupling and distorted-wave theories. There is good agreement between experiment and the 15-state close-coupling cross sections over the energy range of the calculations.