The Coulomb explosion of the H2O molecule under the influence of a pulse of an X-ray free electron laser is studied theoretically. The following points are considered within the framework of the classical mechanics: a description of the motion of Coulomb centers for the case of instantaneous complete ionization of the molecule; phenomenological accounting of sequential ionization of the molecule during irradiation; Dalitz diagrams accounting for peculiar dynamical properties of the Coulomb explosion.
33.80.-b Photon interactions with molecules
$^1$Faculty of Physics M.V.Lomonosov Moscow State University\
$^2$Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moskow 119991, Russia.
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