Abstract
Using a high-resolution setup, we investigate the fragmentation of and in intense 790 nm laser pulses with pulse widths of 28 fs and 80 fs. The measured kinetic energies resulting from effective two-photon dissociation of show a clear dependence on the pulse width and on the isotope. One-dimensional calculations reproduce these effects and show that they mainly originate from the dissociation dynamics. Further, we find that the initial ionic state before dissociation is not simply given as a Franck-Condon distribution over unperturbed ionic states. Rather it is a complex mixture of initial wave packets (covering, however, a small energy range) created by multiphoton ionization of and at various times during the action of the pulse.
- Received 29 March 2000
DOI:https://doi.org/10.1103/PhysRevA.62.063402
©2000 American Physical Society