Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Molecules in Intense Laser Fields (joint session MO/A)

MO 16.3: Vortrag

Mittwoch, 7. März 2018, 14:45–15:00, PA 2.150

Intensity dependence of Photon Energy Sharing in H₂ Multiphoton Ionization — •Patrick Froß, Denhi Martinez, Nicolas Camus, Thomas Pfeifer, and Robert Moshammer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

When ionizing molecules with strong laser fields, the dynamics of photofragmentation determines how the photon energy is shared between the resulting fragments. Understanding this photon energy sharing helps to understand and eventually control the fragmentation process in intense laser fields. Recently Joint-Energy-Spectra (JES) have been observed for dissociative and double ionization of H₂ in order to investigate photon-number-resolved ionization dynamics at laser intensities of 5· 10¹³-1· 10¹⁴ W/cm². We present measurements of full 3D photon-number-resolved momentum distributions in H₂ dissociative and double ionization for different intensities using 35fs laser pulses with a central wavelength of 395nm and recording the reaction fragments with a Reaction Microscope. The JES clearly shows that for high laser intensities events involving different numbers of photons cannot be distinguished anymore.