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Ott et al. (Science (340, 716 (2013)) successfully transferred Fano profileinto Lorentzian lineshape using an intense infrared laser, after excitation ofautoionizing states in helium by attosecond XUV pulse. This is a very importantstep forward of quantum phase control. However, here we show experimentallythat an autoionizing state can have both Fano and Lorentzian behaviornaturally, depending on the process involved. This study utilized the inverseprocess of photon absorption ionization, i.e. electron ion recombination withphoton emission, making sure the resonant autoionizing state is not perturbedby the laser fields. Our result implies that excitation of the state throughdifferent paths can lead to different Fano profiles for the same resonantstate. This allows more options for the combination of laser fields and lead tomore opportunities for quantum phase control. Our result also indicates thebreakdown of the classical two step picture for dielectronic recombination.

Dual Fano and Lorentzian line profile poperties of autoionizing states