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Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
Nuclear Instruments and Methods in Physics Research B, 315, p.81 - 84, 2013/11
Times Cited Count：1 Percentile：11.54(Instruments & Instrumentation)The average charge of the constituent ions resulting from foil-induced dissociation of cluster ion is smaller than that of the single ion passing through the foil at same speed. This charge reduction effect is one of the most important phenomena for understanding the interaction of cluster ions with electrons in a solid, and the theories suggested that it strongly depends on the internuclear distance of the constituent ions. However, the relationship between the internuclear distance and the charge state has still not been shown quantitatively. We developed a method to evaluate the relationship by analyzing the divergence angle of the constituent ions after foil penetration using Coulomb explosion imaging technique. As a result for 6-MeV C
, it was shown quantitatively that the charge reduction effect decreases with increasing the internuclear distance of the constituent ion in the solid.
Chiba, Atsuya
Hoshasen To Sangyo, (134), p.29 - 32, 2013/06
no abstracts in English
ion moving in a solidChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 161, 2013/01
An average charge of the constituent ions resulting from the foil-induced dissociation of cluster ions is smaller than that of monatomic ions at the same speed. It is considered that such a charge reduction effect in cluster ion bombardments depend strongly on the internuclear distance between constituent ions moving in a solid. However, there are few reports in which average charges of the constituent ions had been quantitatively evaluated in terms of their internuclear distance increasing by the screened Coulomb repulsion. Therefore, we developed a method which evaluate quantitatively the average charge for internuclear distance of constituent ions in solid through the measurements of the divergence angle of the constituent ions after foil penetration. The achieved results are approximately equal to the theoretical value derived from model considering the cluster effect in average charge.
Kaneko, Toshiaki*; Ihara, Kosuke*; Kono, Maasa*; Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 164, 2013/01
Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
Dai-25-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.98 - 101, 2012/07
Availability of the swift cluster ion is expected as new irradiation source, because the cluster ion bombardment to the solid brings irradiation effects different from the monatomic ion bombardment at the same speed. This unique effect, cluster effect, is caused via the physical processes that a number of high energy ions within a narrow spatiotemporal region make the high density excited states and that the constituent ion influences with respect to one another. For understanding of the expression mechanism of cluster effect, detailed investigation of these two physical processes are needed. In this study, with a focus on the interaction between constituent ions, we developed an analyzing method that shows quantitatively the relationship between the internuclear distance of constituent ions and their charge states, using the Coulomb explosion imaging technique, to investigate the contribution of the screened Coulomb potential to the cluster effect.
Kaneko, Toshiaki*; Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 153, 2012/01
ionsChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 151, 2012/01
In order to understand the mechanism of charge reduction in cluster ions observed in the foil-transmission experiments, we investigate contributions to charge states of the cluster constituent ions from ion-induced potential. For the C ions passing through a this foil, we found out that the charge states of tracing ions are larger than that of leading ions.
Saito, Yuichi; Shibata, Hiromi*
JAEA-Review 2009-066, 118 Pages, 2010/07
JAEA-Review-2009-066.pdf:26.17MB
This review covers results of the "Study of interaction of swift cluster ion beam with matter and its irradiation effect" supported by the Interorganization Atomic Energy Research Program from FY2006 to FY2008 (Representative; Tomihiro Kamiya (FY2006), Wataru Yokota (FY2007), Takuji Kojima (FY2008) (JAEA), Hiromi Shibata (Kyoto Univ.)). The review is composed of a research abstract of each sub-group with viewgraphs which were presented at the group meeting held on March 2009 and at "Meeting of High LET radiation -From fundamental study among physics, chemistry and biology to medical applications-" sponsored by Japan Society of Radiation Chemistry, cosponsored by our research group.
Kaneko, Toshiaki*; Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa
no journal, ,
no abstracts in English
constituent ions passing through a thin foilChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
no journal, ,
In order to understand the mechanism of charge reduction in cluster ions observed in the foil-transmission experiments, we investigate contributions to charge states of the cluster constituent ions from ion-induced potential. For the C ions passing through a this foil, we found out that the charge states of tracing ions are larger than that of leading ions.
Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
no journal, ,
Irradiation effect per atom under the cluster ion bombardment is not equal to that under the monatomic ion bombardment at the same speed. This unique effect, cluster effect, is caused via the physical processes that a number of high energy ions within a narrow spatiotemporal region make the high density excited states and that the constituent ion influences with respect to one another. In this study, with a focus on the interaction between constituent ions, we developed an analyzing method that shows quantitatively the relationship between the internuclear distance of constituent ions and their charge states, using the Coulomb explosion imaging technique, to investigate the contribution of the screened Coulomb potential to the cluster effect. As a result, we succeeded in showing quantitatively that the cluster effect on charge state was lessened due to the decreased potential with increasing the internuclear distance.
Kaneko, Toshiaki*; Ihara, Kosuke*; Kono, Maasa*; Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa
no journal, ,
no abstracts in English
Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Kaneko, Toshiaki*
no journal, ,
no abstracts in English
Yanase, Shinichiro*; Sugitsue, Noritake; Ishimori, Yuu; Yokoyama, Kaoru; Ohara, Yoshiyuki; Takahashi, Nobuo; Rong, D.*; Takeda, Hiroshi*; Kochi, Toshinori*; Takami, Toshihiro*; et al.
no journal, ,
no abstracts in English
