Low-energy surface collision induced dissociation of Ge and Sn cluster ions |
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Authors: | Y Tai J Murakami C Majumder V Kumar H Mizuseki and Y Kawazoe |
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Institution: | (1) Chubu Research Base, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan;(2) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan |
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Abstract: | Fragmentation of germanium and tin cluster ions
in the low-energy
collisions with a Si surface has been investigated by means of a
tandem time-of-flight mass spectrometer. At low incident
energies, smaller clusters fragmented by an atom loss process,
whereas larger clusters decayed by fission. The favored
fragmentation paths for both cluster ions were similar to those
for Si cluster ions. The results support the structural
similarities among Si, Ge, and Sn clusters in the present size
range. For tin cluster ions, low-energy fragmentation patterns
were compared with those obtained from theoretical calculations
using generalized gradient approximation (GGA) and the B3PW91
exchange-correlation functional. It has been found that the
B3PW91 hybrid functional results are consistent with the
experimental observations. |
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Keywords: | 31 15 Ew Density-functional theory 36 40 Qv
Stability and fragmentation of clusters 36 40 -c Atomic and
molecular clusters |
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