I. Ali, S. Hagmann, P. Richard, L. Cocke
J.R. Macdonald Laboratory, Kansas State University

H. Schmidt-Böcking
Institut fuer Kernphysik, August Euler Str. 6, D60486 Frankfurt, Germany

A Multi-hit detector system has been developed in order to measure the complete momentum vectors of two fragments in the dissociation process of a diatomic molecule. The system was tested by detecting the fragments resulting from the collision process F⁸⁺ + N₂. The fragments are collected in an electrostatic field and detected with a position sensitive micro-channel plates detector using a fast timing delay-line-anode. Complete information about momentum of the detected fragments are measured from the time of flight and position on the multi-hit detector system. The fragments are detected with a high efficiency 100% of 4-pi solid angle. The detector has a position resolution better than 0.2 mm and can resolve fragments, which are separated by at least 10 ns in time. Although the system was tested using the previously mentioned collision system, many charged particles up to 16-fold resulting from the dissociation of a complex molecule or multiple ionization of a many-electron-atom can be detected in the collision process with a photon, an electron or an ion.

Supported by the Division of Chemical Sciences, Office of Basic Energy Sciences, Office of Energy Research, U.S. Department of Energy.

Submitted to DAMOP/APS Centennial Meeting, Atlanta GA, in March 1999

 

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