Visualization of a single cluster particle track in polystyrene films

Asano, Atsushi*; Takano, Katsuyoshi*; Chiba, Atsuya; Saito, Yuichi; Marui, Hiromi*; Omichi, Masaaki*; Maeyoshi, Yuta*; Honsho, Yoshito*; Saeki, Akinori*; Yamada, Keisuke; Narumi, Kazumasa; Seki, Shuhei*

In this study, a visualization of the tracks of fragments from a dissociated cluster ion in a target was tried using polystyrene derivatives with higher sensitivity for the ion beam irradiation. The results were compared with the case of ion beam consisting of single ion, considering the feature of cluster beam irradiation. The ion species were selected to be C and Ti. As a result, the density of the structures at the Ti beam irradiation was almost the same to the ion fluence. However, the density at the C irradiation was much less than the ion fluence. It is supposed that many cluster particles are fragmentized during penetration in the polymer film. The radial dose distribution inside a particle tracks is decreased, and then the cross-linking reaction is induced insufficiently. In order to visualize the tracks of the fragmentation, optimization of the development or selection of materials with higher sensitivity should be needed.