The knowledge of the ionization of water is essential in different fields such as Biology and Atomic Physics. Basicreactions involving this molecule are crucial to understand the interaction between radiation and the biologicaltissue because living cells are composed mostly by water. Therefore, we study theoretically the laser-assistedphotoionization of water molecules by attopulses in the streaking regime by means of a Coulomb-Volkov model.We analyze reactions initiated by an extreme ultraviolet single attosecond pulse assisted by a near-infrared laser.The initial molecular wavefunctions are described by using the Moccia's monocentric wavefunctions whereas thefinal state wavefunctions are given by the separable Coulomb-Volkov type wavefunctions. We obtain analyticalexpressions for the observables of interest. We calculate photoelectron spectra as a function of the delay betweenthe attopulse and the assistant laser field for water molecules. Several polarization configurations of pulses andassistant laser are considered. Particularly, we focus on the conditions where asymmetries are generated in theobservables and we examine those under which these asymmetries could be enhanced and/or diminished leadingto a directional selectivity of the photoelectron emission. Consequently, we hope our work promotes progresson the control of the chemical reactivity of water as this could be useful in many domains of radiobiology andmedical physics. Finally, we expect these studies contribute to the improvement of attopulses and assistant lasertechnologies as well as to the development of new polarization and delay control experiments.
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