Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Atomic systems in external fields II
A 8.2: Vortrag
Montag, 29. Februar 2016, 14:45–15:00, f303
Few-cycle effect in dissociative ionization of H2+ — •Volker Mosert and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock
We investigate the dissociative ionization of H2+ for few-cycle infrared laser pulses by solving the TDSE for a low dimensional model Hamiltonian including the nuclear degree of freedom.
For laser intensities I≈1014 W cm−2 the joint electron-proton spectrum exhibits intensity modulations with respect to the kinetic energy of the protons
but almost independent of the electron’s kinetic energy.
This modulation of ionization probability is reproduced in the frozen core approximation and in other binding potentials with variable ionization potential.
Furthermore the modulation of ionization yield goes hand in hand with the occupation of the first excited state of the system at the end of the pulse,
and the existence of an excited bound state turns out to be a necessary condition for the effect.
By employing a two state model we can reproduce the modulation of excited state occupation and ionization yield qualitatively.
We provide an analytical solution for the occupation of the two states in this model,
which is valid when ionization and occupation of excited states is small.
This model predicts a similar modulation of the ionization yield when the wavelength is varied (ionization potentials fixed)
which is confirmed by TDSE simulations.
Finally we discuss the carrier envelope phase dependence of the effect.
[1] V. Mosert, D. Bauer, Phys. Rev. A 92, 043414 (2015)