Abstract
We present a theoretical study of H+2 ionization under strong femtosecond pulses by using a method designed to extract correlated 2D photoelectron and proton kinetic energy spectra. There appear two different ionization mechanisms in which electrons and nuclei do not share the energy in the same way. Electrons produced in multiphoton ionization share part of their energy with the nuclei, leading to energy-conservation fringes in the 2D spectra. In contrast, tunneling electrons lead to fringes whose position does not depend on the proton kinetic energy. This suggests that the correlation between electron and nuclear dynamics in strong field ionization is more complex than expected.
Highlights
We present a theoretical study of Hþ2 ionization under strong IR femtosecond pulses by using a method designed to extract correlated (2D) photoelectron and proton kinetic energy spectra
Since the potential induced by such lasers on the electrons is comparable to or even stronger than that generated by the nuclei, the resulting electron dynamics is significantly different from that of the isolated system, which makes these lasers ideal tools to achieve electronic control [10,11,12,13]
A few attempts in this direction have been reported in the context of high-harmonic generation (HHG) [30] and light-induced-electron diffraction [12], where atomic displacements have been detected by measuring the harmonic emission and the ionized electrons, respectively
Summary
We present a theoretical study of Hþ2 ionization under strong IR femtosecond pulses by using a method designed to extract correlated (2D) photoelectron and proton kinetic energy spectra. Density plots for the correlated photoelectron and nuclear-kinetic energy spectra resulting from Hþ2 photoionization by using the following pulses: (a) 1⁄4 400 nm, T 1⁄4 16 fs, and I 1⁄4 1014 W=cm2, (b) 1⁄4 400 nm, T 1⁄4 16 fs, and I 1⁄4 4 Â 1014 W=cm2, (c) 1⁄4 800 nm, T 1⁄4 32 fs, and I 1⁄4 1014 W=cm2, and (d) 1⁄4 800 nm, T 1⁄4 16 fs, and I 1⁄4 2 Â 1014 W=cm2.
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