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Single photon laser enabled Auger decay (spLEAD) has been redicted theoretically [Phys. Rev. Lett. 111, 083004 (2013)] and here we report its first experimental observation in neon. Using coherent, bichromatic free-electron laser pulses, we have detected the process and coherently controlled the angular distribution of the emitted electrons by varying the phase difference between the two laser fields. Since spLEAD is highly sensitive to electron correlation, this is a promising method for probing both correlation and ultrafast hole migration in more complex systems.

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Crossed beams of electrons and In + ions were used to measure the relative emission cross-sections of the ionization-with-excitation process of the In 2+ ion laser transitions at λ185.0 nm and λ153.3 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 4d 10 nl ordinary and 4d 9 5snl Beutler states of the In 2+ ion as well as the excitation-autoionization process. It was discovered that, contrary to the Cd + ion case, the relative emission cross-section of the 4d 9 5s 2 2 D 5/2 → 4d 10 5p 2 P 3/2 In 2+ ion transition is smaller than that of the 4d 9 5s 2 2 D 3/2 → 4d 10 5p 2 P 1/2 In 2+ ion transition in the whole investigated region.