The influence of the Coulomb explosion on the energy loss of H+2 and H+3 molecules channeling along the Si(100) direction

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:230

Article; Proceedings Paper

Fadanelli, RC ; Grande, PL ; Behar, A ; Dias, JF ; Schiwietz, G

关键词: channeling;    energy loss;    Coulomb explosion;   

DOI  :  10.1016/j.nimb.2004.12.024

来源: Elsevier

【 摘 要 】

In this work we have measured the contribution of the Coulomb explosion to the electronic stopping power of molecular hydrogen ions (H-2(+) and H-+(3)) channeling along the Si < 100 > direction. We have used a SIMOX target, consisting of crystalline Si < 100 > with a buried layer Of SiO2. The measurements of the energy loss of H+,H-2(+) and H-3(+) have been carried out using the standard channeling Rutherford backscattering spectrometry. The energy loss has been measured around the Si < 100 > channel at a fixed energy per nucleon (150 keV/amu) as a function of the tilt and azimuthal angles. The present results show the effect of Coulomb explosion, which enlarges the protons traversal energy and consequently the channeling energy loss. This heating effect due to H-3(+) ions is about two times larger than H-2(+) molecules and amounts to about 5% of the total stopping power. (c) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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