Photo fragmentation of metal clusters stored in a penning trap

Abstract

Photo fragmentation studies of stored mass selected metal cluster ions of a large size range are reported. The experimental method and the data evaluation are described in detail. Gold cluster ions were produced by laser vaporization and stored in a Penning trap. After size selection they were electronically excited by irradiation with a pulsed laser beam. Relaxation by evaporation of neutral atoms and dimers was observed as a function of photon energy. From these data upper and lower limits for dissociation energies are determined for Au> L (n"3 to 23).

Photodissociation of small group-11 metal cluster ions: Fragmentation pathways and photoabsorption cross sections

“…These conditions are fulfilled, as justified above. The fraction of clusters that absorb a photon and thus undergo dissociation is given by [39] …”

“…The number of clusters which absorb two or more photons relative to the number of clusters which absorb one photon is for the present low laser intensities given by [39] …”

First Observation of Multiply Charged Vanadium Clusters in a Penning Trap

“…Collisioninduced dissociation has already been applied to Au n 2 + , Au n 3 + , 15 Ag n 2 + , 16,17 Cu n 2 + and Pt n 2 + . 18 Photodissociation [25][26][27][28] or chemical investigations [29][30][31][32] may also be performed.…”

Ion-molecule reactions of Ru+ and Os+ with oxygen in a Penning trap

“…The ions of interest are centered by a combination of buffer gas collisions and a quadrupolar excitation [29] and confined within a region of about 2 mm diameter in the middle of the trap [30]. After a reaction period of up to several seconds, the charged products are ejected out of the trap into a time-of-flight (TOF) mass-spectrometer for mass analysis.…”