Experimental study of structure in enhanced ionization of H$_{2}^{+}$ in intense ultrashort laser pulses

I. Ben-Itzhak, P.Q. Wang, A.M. Sayler, K.D. Carnes, B.D. Esry, A.S. Alnaser, B. Ulrich, X.M. Tong, I.V. Litvinyuk, C.M. Maharjan, P. Ranitovic, T. Osipov, R. Ali, S. Ghimire, Z. Chang, C.D. Lin, C.L. Cocke
( J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan KS 66506, USA)

Charge resonance enhanced ionization (CREI) of H$_{2}^{+}$ in intense ultrashort laser pulses was measured using molecular dissociation imaging of an H$_{2}^{+}$ beam and with a pump-probe technique using COLTRIMS on an H$_{2}$ target. The dependence of the ionization probability on the internuclear distance is determined independently from both measurements using a simple model for the initial dissociation step. Both data sets lead to a similar R-dependence which indicates that ionization is enhanced at large internuclear distances as predicted by theory [1]. However, in contrast to the predictions for a double peak structure, only one broad peak is observed. [1] T. Zuo and A.D. Bandrauk, Phys. Rev. A \textbf{52}, R2511 (1995)

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, and by
the National Science Foundation.

Submitted to DAMOP, May 2006 in Knoxville, TN.

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