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Ishikawa, Norito; Fukuda, Shoma; Nakajima, Toru; Ogawa, Hiroaki; Taguchi, Tomitsugu*
no journal, ,
In the present study, we analyze both the surface hillocks and ion tracks by using transmission electron microscopy (TEM). The size of hillocks directly reflects the size of the molten region. On the other hand, the ion tracks in the bulk reflects transiently melting and subsequent recrystallization. Therefore, it is expected that observation of both nanostructures (in the same observation window) allows us to examine the whole nanostructure formation processes including melting and recrystallization. The TEM observation results show that hillocks and ion tracks are created in natural zirconia (baddeleyite from South Africa) and in nanoparticle zirconia samples. It is also found that hillock size is always larger than the ion track size, indicating the recrystallization process plays an important role in ion track formation.
Yamakawa, Koichiro; Nasu, Hirokazu*; Suzuki, Natsumi*; Shimizu, Genki*; Arakawa, Ichiro*
no journal, ,
Nano-sized molecular clusters have been intensively investigated in a spectroscopic way to reveal the nature of intermolecular interaction. Compared with the infrared (IR) range, only a few spectral measurements in the terahertz (THz) range have been reported, so that the assignment of the vibrational mode to THz absorption was not established even for the water dimer. In the present study, we constructed an experimental apparatus for THz-IR absorption spectroscopy in an ultrahigh vacuum and measured spectra of deuterated-water clusters formed in solid Ar to identify the THz absorption peaks of the dimer, trimer, and tetramer.