The Coulomb explosion of molecular ions in channeling conditionsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The backscattering energy spectra of protons have been measured with 650 keV/atom H+, H-2(+) and H-3(+) beams irradiating Si crystal in <100> and <110> directions. The Coulomb explosion of molecules on entering a crystal results in significant modification of the transverse energy distribution of channeled protons, the molecular fragments. This shows itself as a significant increase of the dechanneling rate as compared with the case of atomic ion beam. Relative to H+, the observed backscattering yield for H-2(+) and H-3(_)+ is substantially higher, up to 30% in the latter case. The data show that the Coulomb explosion appears to be more effective for H-3(+) molecular ions. The measurement results are compared with the corresponding computer simulation. The calculations demonstrate, particularly, the character of coordinated motion of the molecular fragments predetermined by the correlated initial conditions at the crystal surface. (C) 2002 Elsevier Science B.V. All rights reserved.