Abstract
Heavy ion irradiations of α-quartz have been performed using 1 MeV 4He, 30 MeV 16O, 110 and 168 MeV 58Ni, 188 MeV 127I and 3.5 GeV 238U. The induced damage has been determined using channeling Rutherford backscattering with a 4He beam of 3 MeV. In the electronic stopping power range investigated (1.5–104 MeV cm 2 mg −1), the electronic stopping power damage efficiency increases by at least four orders of magnitude. Moreover, irradiations have also been performed in channeled and random conditions. The influence on the track creation mechanism of inner-shell excitations was checked by comparison between channeling and random irradiations. It is not necessary to invoke inner-shell excitations followed by an Auger decay in order to account for the damage efficiency.
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