Low fluence swift heavy ion irradiation of amorphous germanium
نویسندگان
چکیده
Synchrotron based Small Angle X-ray Scattering (SAXS) give evidence of SHI irradiation induced ion-tracks in a-Ge. The scattering spectra of the ion-tracks can be fitted by using a model function of a cylindrical electron density distribution with an internal core shell structure. Core and shell are both of constant electron density but one being overthe other under-dense with respect to the surrounding a-Ge matrix. The dimension of core and shell add up to an over-all ion-track radius of 11.1±0.8 nm. The scattering intensity of the SAXS spectra scales with the ion-fluence up to a fluence of 110 11 cm -2 where the overlap of the ion-tracks is negligible. Scattering features in the SAXS spectra start to become blurred due to an increased ion-track overlap (40% for 310 11 cm -2 ) and indicates that the scattering is not coming from separated ion-tracks anymore.
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