Title: Alpha-emission channeling investigations of the lattice location of Li in Ge
Authors: Wahl, Ulrich
Jahn, SG
Restle, M
Ronning, C
Quintel, H
BharuthRam, K
Hofsass, H
Issue Date: Sep-1996
Publisher: Elsevier science bv
Series Title: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms vol:118 issue:1-4 pages:76-81
Abstract: The alpha-emission channeling and blocking technique is a direct method for lattice site determination of radioactive atoms in single crystals. Position-sensitive detection of emitted alpha-particles provides an efficient means of carrying out such experiments at very low doses (10(10)-10(11) cm(-2) implanted probe atoms per spectrum), Comparison of the experimental data with Monte Carlo simulations of complete two-dimensional channeling patterns (e,g. +/-2 degrees around [100], [110] and [211] axes, which also includes all relevant planar directions) allows for straightforward identification and quantitative determination of occupied lattice sites, while at the same time the energy spectrum of emitted alpha-particles gives information on the probe atom depth distribution. We illustrate this for the case of ion implanted Li-8 (t(1/2) - 0.8 s) in Ge, where we identify mainly tetrahedral Li at room temperature, and bond-centered Li at slightly elevated temperature.
ISSN: 0168-583X
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Non-KU Leuven Association publications

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