Molecular Dynamics in the Rescattering and Sequential Double-Ionization of H_2 in Ultra-Short laser Pulses.

A.S. alnaser, T. Osipov, X.M. Tong, S. Voss, B. Shan, C. Mahrajan, Z. Chang, C.D. Lin, C.L. Cocke
(J.R.Macdonald Laboratory, Physics Department, Kansas State Univ., Manhattan, KS, 66506)

We present a systematic study on the Coulomb explosion of H_2 when exposed to ultra short laser pulses. The relative contribution of rescattering versus sequential double- ionization is presented over a range of 8- 40 fs pulse duration and 1-12 X 10^1^4 watt/cm^2 laser peak intensity. The proton pairs produced in the Coulomb explosion of H_2 were measured in coincidence using a standard COLTRIMS arrangement. The kinetic energy released in these explosions was used to deduce information about the evolution of the molecular hydrogen when ionized by the laser field. A quantitative model is compared with the experimental data and accounts for the major features observed in the experiment.

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.

Submitted to DAMOP, May 2004 in Tucson, AZ.

 

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