Showing papers by "Lutz Schweikhard published in 1997"
••
TL;DR: In this article, gold and silver cluster ions were produced by laser vaporization and stored in a Penning trap, after mass selection the cluster sizes of interest were illuminated by a laser pulse and electronically excited.
Abstract: Gold and silver cluster ions were produced by laser vaporization and stored in a Penning trap. After mass selection the cluster sizes of interest were illuminated by a laser pulse and electronically excited. Photoabsorption cross sections and fragmentation patterns were measured for photon energies of 2.3 eV to 5.2 eV. Unimolecular dissociation was observed time resolved on a microsecond to millisecond scale. Dissociation energies were deduced from the measured life times.
24 citations
••
TL;DR: In this article, the low energy dissociation channels of mass selected silver cluster ions were determined by collision induced dissociation (CID) in a Penning trap, and the observed fragmentation pathways were different from previous reports of measurements with sputtered ions.
Abstract: The low-energy dissociation channels of mass selected silver cluster ions Ag
n
2+
(n = 9–24) are determined by collision induced dissociation (CID) in a Penning trap. While all clusters of the size n ≥ 17 evaporate neutral monomers, most smaller clusters undergo asymmetric fission of the form Ag
n
2+
→ Ag
−3
+
+ Ag
{3}
+
. However, Ag
15
2+
and Ag
11
2+
emit monomers which indicates shell or odd-even effects. The observed fragmentation pathways are different from previous reports of measurements with sputtered Ag
n
2+
.
17 citations
••
14 citations
••
TL;DR: In this paper, Doubledly charged silver clusters Agn 2+, n=21, 22, 23, n = 21, 22 and 23 are produced by electron bombardment of an Agn + ensemble stored in a Penning trap.
Abstract: Doubly charged silver clusters Agn
2+, n=21, 22, 23, are produced by electron bombardment of an Agn
+ ensemble stored in a Penning trap. After mass selection the clusters are subjected to collision induced dissociation. The fragmentation channels are determined by time-of-flight mass spectrometry after ejection of the resulting ion ensemble from the trap. Monomer evaporation is the only decay path observed.
11 citations
••
9 citations