Emission cross-sections of the In2 + ion VUV laser transitions at electron–In+ ion collisions

Crossed beams of electrons and In+ ions were used to measure the relative emission cross-sections of the ionization-with-excitation process of the In2 + ion laser transitions at Delta *l185.0 nm and Delta *l153.3 nm from the threshold up to 120 eV. A pronounced structure is observed for both energy dependences in the region from the threshold up to 80 eV. The structure results mostly from the contributions of cascade transitions from both ordinary and Beutler states of the ion as well as the excitation--autoionization process. It was discovered that, contrary to the ion case, the relative emission cross-section of the ion transition is smaller than that of the ion transition in the whole investigated region.