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Journal Article

Recovery of High-Energy Photoelectron Circular Dichroism through Fano Interference


Trinter,  Florian
Deutsches Elektronen-Synchrotron (DESY);
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Hartmann, G., Ilchen, M., Schmidt, P., Küstner-Wetekam, C., Ozga, C., Scholz, F., et al. (2019). Recovery of High-Energy Photoelectron Circular Dichroism through Fano Interference. Physical Review Letters, 123(4): 043202. doi:10.1103/PhysRevLett.123.043202.

Cite as: http://hdl.handle.net/21.11116/0000-0004-5F6D-9
It is commonly accepted that the magnitude of a photoelectron circular dichroism (PECD) is governed by the ability of an outgoing photoelectron wave packet to probe the chiral asymmetry of a molecule. To be able to accumulate this characteristic asymmetry while escaping the chiral ion, photoelectrons need to have relatively small kinetic energies of up to a few tens of electron volts. Here, we demonstrate a substantial PECD for very fast photoelectrons above 500 eV kinetic energy released from methyloxirane by a participator resonant Auger decay of its lowermost O 1s excitation. This effect emerges as a result of the Fano interference between the direct and resonant photoionization pathways, notwithstanding that their individual effects are negligibly small. The resulting dichroic parameter has an anomalous dispersion: It changes its sign across the resonance, which can be considered as an analogue of the Cotton effect in the x-ray regime.