Abstract
We investigate the fragmentation behaviour of size selected sodium clusters Na n , n≤5, for different ionization methods. The experimental technique, size selection by means of scattering the cluster beam from a helium target beam, enables us to find a unique correlation between the detected cluster ions and their neutral precursors. In the case of photoionization we use the light from a Xe-arc lamp in a broad spectral range down to a wavelength of about 220 nm, whereas for the pulsed, frequency doubled dye laser the wavelength is tuned to 265 and 290 nm. Electron impact ionization has been examined with an electron energy of 25 eV. The ionization by electron impact with the large excess energy results in a total fragmentation of the sodium trimer. In the case of photoionization the fragmentation probabilities depend sensitively on the excess energy.
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