Mapping and Controlling Ultrafast Dynamics of Highly Excited D2$+$ by Attosecond XUV Radiation
ORAL
Abstract
We show how spectrally tailored attosecond extreme ultraviolet and femtosecond infrared radiation can be used to coherently populate, map and control dynamics of highly excited states of D$_{\mathrm{2}}^{\mathrm{+}}$ that rapidly dissociate. In particular, we used a 43 eV XUV and a weak IR beam to coherently populate highly excited electronic states of D2$+$ through one- and two-photon absorption processes. By using time-delayed probe laser pulses and 3D momentum imaging in a COLTRIMS geometry, we show how the dissociation can be mapped and controlled on attosecond time scales using Coulomb-explosion imaging. We found that the major excitation channel, dissociating to the n$=$2 limit, perpendicular to the XUV/IR radiation, is not the 2pPi\textunderscore u, as discussed in literature, but the 2s Sigma\textunderscore g.
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