Electron capture into excited states of low-energy Krq+(q = 8-7) ions

The low-energy charge exchange collision between Kr8+ and Kr7+ projectiles and He or H2 targets have been studied by vacuum ultraviolet spectroscopy. New lines are identified. Emission cross sections of the observed transitions have been measured. Absolute cross sections of the n and l projectile excited states formed by single electron capture have been deduced. The double electron capture and transfer ionisation processes have also been observed and measured. Excitation of the He target has been observed. (author)