Results 1 - 10 of 3975
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[en] The Rutherford scattering of a classical point charge moving in an attractive field and obeying the Lorentz-Dirac equation is solved. The size of the spatial part of the incoming 4-velocity (γ2-1)1/2 takes the values 1000, 100 and 0.1, respectively. Asymptotic expansions of physical solutions are derived and used. Results are displayed and discussed. It is shown that all solutions satisfy physical expectations. A condition for treating radiation reaction as a perturbation is applied. Some earlier problems that have led to suggestions of unphysical features of the Lorentz-Dirac equation are explained on a physical basis. (author)
[en] Channeling effect on a silicon single-crystal wafer cut along parallel to its (111) plane was investigated by using Rutherford back-scattering technique. Critical angles were measured for 325, 395 and 400 keV incoming proton energies. Experimentally measured parameters were compared to Lindhard's simple continuoum model calculations. (author)
[en] We have observed an amorphous to polycrystalline Si transformation with concurrent Sn redistribution in Sn-implanted Si at temperatures well below those at which solid phase epitaxial growth, or random crystallization, is observed to take place in undoped Si. The process is extremely rapid and characterised by a strong dependence on Sn concentration and temperature. We propose that this is mediated by molten Sn-rich precipitates in the amorphous Si
[en] Rapid thermal vacuum processing (RTVP) has been used to form titanium silicide (TiSi2). The time/temperature window offered by this technique enables the various phases (Ti5Si4, TiSi and TiSi2) to be observed using Rutherford backscattering techniques. Furthermore the kinetics of formation found using this approach lead to an activation energy of ∼ 1.7 eV but with a reaction rate constant almost an order of magnitude larger than previously reported data. We also report on a reaction delay time that is consistent with the pre-disilicide phase formation
[en] The Rutherford scattering experiment plays a central role in working out atomic models in physics and chemistry. Nevertheless, the experiment is rarely performed at school or in introductory physics courses at university. Therefore, we realized this experiment as a remotely controlled laboratory (RCL), i.e. the experiment is set up in reality and can be operated by a computer via the Internet. We present results of measurements and supplementary didactical material. In addition, we make suggestions on how to use the RCL in class and we describe the added value of performing this experiment as an RCL.