Dresden 2011 – scientific programme
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MO: Fachverband Molekülphysik
MO 28: Poster: Theory: Molecular Dynamics
MO 28.4: Poster
Thursday, March 17, 2011, 16:00–18:00, P1
Water molecules in ultrashort intense laser pulses — •Simon Petretti1, Alejandro Saenz1, Alberto Castro2, and Piero Decleva3 — 1Humboldt-Universität zu Berlin, Germany — 2Universidad Zaragoza, Spain — 3Universitá di Trieste, Italy
Ionisation of water molecules exposed to ultrashort intense laser pulses is studied theoretically within a newly developed single-active-electron approximation [1,2]. In this approach the three-dimensional time-dependent Schrödinger equation describing one electron in the combined field of a multi-centred molecular core and the laser field is solved numerically.
It is shown that for a laser wavelength of 800 nm and for a variety of laser intensities the alignment-dependent ionisation of single orbitals can be interpreted and explained by means of the orbital structure. This is demonstrated by a three-dimensional representation of the ionisation yield of the orbitals that reflects well their shape.
One of the key characteristics of water molecules is their relatively large
dipole moment. Thus, it is in principle not only possible to consider aligned,
but also oriented molecules in which, e.g., the molecular dipole moment points
parallel or anti-parallel to the laser field.
It is shown that the ion yield in ultrashort phase-stablized laser pulses
strongly depends on the absolute orientation.
[1] Awasthi et al., Phys. Rev. A, 77, 063403 (2008).
[2] Petretti et al., Phys. Rev. Lett., 104, 223001 (2010).