Observation of Above-Threshold Dissociation of Na$_2^+$ in Intense Laser Fields

Details Observation of Above-Threshold Dissociation of Na$_2^+$ in Intense Laser Fields Observation of Above-Threshold Dissociation of Na$_2^+$ in Intense Laser Fields

2008-06-17

arxiv.org/abs/0806.2762v5

Phys. Rev. A 78, 021403(R), 2008

Physics

Chemical Physics

15 pages, 3 figures, accepted to Phys. Rev. A (Rapid Communications)

Scientific paper

10.1103/PhysRevA.78.021403

We report the observation of above-threshold dissociation of a multielectron molecular system, Na$_2^+$. The process is due to continuum-continuum transitions in a field-dressed molecular continuum. Three well resolved fragmentation channels with different kinetic energy release patterns have been detected, of which, two are associated with ordinary photodissociation via light-induced potentials into Na(3s) + Na$^+$ and Na(3p) + Na$^+$, and one with continuum-continuum transitions and above-threshold dissociation into Na(3p) + Na$^+$. We show that when we dress this molecule with a field whose intensity is ~3 x 10$^{12}$ W/cm$^2$, above-threshold dissociation prevails over other processes, such as field-ionization followed by Coulomb explosion.

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