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Much more information is present on the map than on the averaged, 1D spectrum. The single, often broad and indistinct peaks on the 1D spectrum, are resolved into several islands on the map. Fig. 4 shows magnified core-core and core-valence regions with several ionization sequences identified unambiguously. In the D<sub>KV</sub> process the two electrons ejected share arbitrarily the energy available from a single proton producing a conspicuous line ''E<sub>x</sub>'' + ''E<sub>y</sub>'' = const in the left panel of Fig. 4. Impurities, such as water vapour or nitrogen, give islands usually away from the islands of the species studied (see Fig. 3b,e,f).
'''Figure 4: Identification of neon ionization processes in the core-core (left) and core-valence (right) correlation regions.''' The top of the autocorrelation line is cut off to show the features behind. Symbols P, D, and A denote, respectively, ejection of a photoelectron, two photoelectrons (direct double
photoionization by a single photon), and an Auger electron.
==Partial covariance mapping==
... N2 pcov stages
<ref name="OK13">O Kornilov, M Eckstein, M Rosenblatt, C P Schulz, K Motomura, A Rouzée, J Klei, L Foucar, M Siano, A Lübcke, F. Schapper, P Johnsson, D M P Holland, T Schlatholter, T Marchenko, S Düsterer, K Ueda, M J J Vrakking and L J Frasinski "Coulomb explosion of diatomic molecules in intense XUV fields mapped by partial covariance" ''J. Phys. B: At. Mol. Opt. Phys.'' '''46''' 164028 (2013), [http://hdl.handle.net/10044/1/12267 open access]</ref>
==See also==
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