Dissociation of diatomic molecular ions in ultrafast intense laser fields probed by coincidence 3D momentum imaging

Itzik Ben-Itzhak, Pengqian Wang, Jiangfan Xia, Kevin D. Carnes, A.Max Sayler, Mark A. Smith, Jack W. Maseberg
(Kansas State University)

Laser induced dissociation of some diatomic molecular ions, including H_2^+, N_2^+ and O_2^+, has been investigated by coincidence 3D momentum imaging. The keV energy ion beam is crossed by an ultrafast intense laser beam, and the resultant fragments are recorded by a position-sensitive detector. The momentum vector of each fragment is evaluated, and the true coincidences are selected by momentum conservation. A vibrationally resolved kinetic energy distribution is obtained. The kinetic energy release is analyzed in a complete angular distribution, which reveals valuable information on the dissociation dynamics of molecular ions. Laser induced bond-softening and trapping effects (as well as other phenomena) have been observed. Dissociative ionization, the weaker channel, is studied simultaneously.

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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