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. 2011 Nov 4;107(19):193004.
doi: 10.1103/PhysRevLett.107.193004. Epub 2011 Nov 4.

Evidence of single-photon two-site core double ionization of C2H2 molecules

P Lablanquie  1 , T P Grozdanov, M Zitnik, S Carniato, P Selles, L Andric, J Palaudoux, F Penent, H Iwayama, E Shigemasa, Y Hikosaka, K Soejima, M Nakano, I H Suzuki, K Ito
Affiliations

Evidence of single-photon two-site core double ionization of C2H2 molecules

P Lablanquie et al. Phys Rev Lett. .

Abstract

We observe the formation in a single-photon transition of two core holes, each at a different carbon atom of the C2H2 molecule. At a photon energy of 770.5 eV, the probability of this 2-site core double ionization amounts to 1.6 ± 0.4% of the 1-site core double ionization. A simple theoretical model based on the knockout mechanism gives reasonable agreement with experiment. Spectroscopy and Auger decays of the associated double core hole states are also investigated.

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