(a) Schematic diagram of the geometry of the setup. is perpendicular to the propagation direction of the synchrotron radiation and to the spectrometer axis (vertical). P is the momentum vector of an ion. (b) Detector image of O+ measured in coincidence with CO+ at the C 1s→ π* resonance. The arrow indicates the direction of the polarization vector. (c) The distribution of measured ions as a function of angle θ is shown including statistical error bars. Each point represents the integration over ϕ = 0 → π, and over Δθ = 11.25°. The solid line shows the best fit of Eq. (4). The best fit was found for β = −0.48 ± 0.02.
(a) Distribution of C+ ions measured in the C+/ coincidence events at the C 1s→ π* resonance. The arrow indicates the direction of the polarization vector. (b) The distribution of ions as a function of angle θ as in Fig. 1. The lines shows the best fits of Eq. (4). (c) The distribution of total kinetic energy of the fragment pair is shown for excitation at C 1s→ π* and O 1s→ π*.
Dalitz plots of the fragments measured at different photon energies for three-body fragmentation events. The upper plots are for detection of C+ in coincidence with O+, and the lower plots show the distribution for detection of three charged fragments. (a) Photon energy of 60 eV, (b,b′) 270 eV, (c,c′) 290.7 eV (C 1s→ π*), and (d) 535.4 eV (O 1s→ π*).
Dalitz plots of kinetic-energy filtered subsets of ionic C and O fragments measured at the C 1s-π* resonance. (a) Events fulfilling the criteria 1 eV 5 eV. These correspond to sequential dissociation originating in the carbon dioxide dication. (b) Coincidence events fulfilling the criteria −2 eV <E(O +) − E(O) <2 eV and 13 eV <E(O +) + E(O). These correspond to concerted breakup from the linear trication. (c) The high-energy carbon fragment (5 eV <E(C +)) indicates concerted breakup from the severely bent dication. (d) Angular correlation plots for the data from the subsets in (b) and (c).
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