Abstract
Using asymmetric two-color laser fields composed of 1800 and 900nm, we have simultaneously controlled four well identified fragmentation channels in dissociative ionization of the hydrogen molecule, resulting in enhanced electron-localization sensitivities of up to 65%.
Highlights
In the two-colour technique, which is experimentally significantly easier to implement compared to CEP stabilized few-cycle pulses, an asymmetry over such a relatively long duration can be achieveds, since the electric field can basically be tailored on any chosen timescale
(IV) Recollision excitation (RE, purple kinetic energy (KE) region): While channels (I-III) arise from radiative coupling of the molecule with the laser field, channel (IV) results from an inelastic recollision of the ionized electron with its remaining molecular ion. This leads to an excitation of the molecule to the σu dissociative state (A)
The actual control effect occurs from an overlap of involved nuclear wavepackets in space and time on the potential energy surfaces – in general the case when their kinetic energy distribution is similar
Summary
For the experiments reported here, MIR two- colour (1800 and 900nm) laser pulses of 50fs duration were used to coherently control the dissociative ionization of H2 and D2 molecules [1,2]. In the two-colour technique, which is experimentally significantly easier to implement compared to CEP stabilized few-cycle pulses, an asymmetry over such a relatively long duration can be achieveds, since the electric field can basically be tailored on any chosen timescale.
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