Japan Geoscience Union Meeting 2014

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Oral

Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS24_1PM2] Origin and evolution of materials in space

Thu. May 1, 2014 4:15 PM - 6:00 PM 415 (4F)

Convener:*Shogo Tachibana(Department of Natural History Scieces, Hokkaido University), Hitoshi Miura(Graduate School of Natural Sciences, Department of Information and Biological Sciences, Nagoya City University), Takafumi Ootsubo(Astronomical Institute, Tohoku Unuversity), Mitsuhiko Honda(Department of Mathematics and Physics, Kanagawa University), Chair:Shogo Tachibana(Department of Natural History Scieces, Hokkaido University)

5:45 PM - 6:00 PM

[PPS24-P02_PG] Ion-induce nucleation experiment II: free energy of the water-cluster ion

3-min talk in an oral session

*Hiroshi HIDAKA1, Yoichi NAKAI2, Takao KOJIMA M.3, Naoki WATANABE1 (1.Inst. Low Temp. Sci., Hokkaido Univ., 2.RIKEN Nishina Center, 3.RIKEN Atomic Physics Laboratory)

Keywords:interstellar grain, cluster ion, nucleation

Ion-induce nucleation in gas phase is an important mechanism for grain formation in various circumstances. However, the number of works regarding this formation mechanism is very limited. To investigate the elementally processes of ion-nucleation mechanism, we recently developed a new apparatus (See, the presentation by N. Watanabe in this session). Using this apparatus, the cluster ion formation with an ion core mass-selected, which is the first stage of nucleation, can be observed quantitatively. In this presentation, we show the results of experiment on water-cluster ion formation in which free energies with the size of cluster have been determined. The experiment was performed at temperatures in range of 230-400 K with the supersaturation ratio of about 10-3-10-2.