IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Monday Sessions
       Session SS3-MoP

Paper SS3-MoP5
Formation of Boron-carbon Binary Clusters by Reactive Molecular Ion Irradiation

Monday, October 29, 2001, 5:30 pm, Room 134/135

Session: Clusters and Aerosols Poster Session
Presenter: H. Yamamoto, Japan Atomic Energy Research Institute
Authors: H. Yamamoto, Japan Atomic Energy Research Institute
T. Saito, Japan Atomic Energy Research Institute
H. Asaoka, Japan Atomic Energy Research Institute
Correspondent: Click to Email
We have observed boron-carbon clusters (B@sub n@C@sub m@) emitted from a boron surface under irradiation of reactive molecular ions, such as C@sub 6@F@sub 5@@super +@, at 2-8 keV, 1µmA/cm@super 2@. In our previous work, enhanced silicon (Si@sub n@@super +@, n@<=@8) and carbon (C@sub n@@super -@, n@<=@12) cluster formation have been observed emitted from an Si(100) and graphite surface under irradiation of molecular SF@sub 5@@super +@ ions at 4 keV, 1µmA/cm@super 2@.@footnote 1@ In both clusters, the intensities of n=4 and 6 are relatively higher than those of the neighboring clusters. Silicon-carbon binary cluster was also observed by the irradiation of C@sub 6@F@sub 5@@super +@ to Si(100) surface. However, Si@sub n@C@sub m@ binary clusters which contain more than two carbon atoms (m@>=@2) were scarcely observed.@footnote 2@ In the present study, B@sub n@C@sub m@ binary clusters are formed through the reaction between the irradiated ion and target atoms. The observed clusters show a yield alternation between odd and even number of constituent atoms. The intensities of n+m=4 and 6 clusters are relatively higher than those of the neighboring clusters even at the present condition. The intensities of the B@sub n@C@sub m@ clusters (m@>=@2) are also higher than those of Si@sub n@C@sub m@ (m@>=@2). It can be considered that the B@sub n@C@sub m@ (m@>=@2) clusters are more stable than Si@sub n@C@sub m@ (m@>=@2) since the diameter of the boron and carbon atoms are not so different.. @FootnoteText@ @footnote 1@ H. Yamamoto and Y. Baba, Surf. Sci., 433-435 (1999) 890. @footnote 2@ H. Yamamoto and H. Asaoka, Appl. Surf. Sci., 169-170 (2001) 305.