KOSEN 한인과학기술자네트워크

답변이 늦어서 대단히 죄송합니다. KOSEN8 입니다. 요청하신 논문의 PDF 파일을 첨부해 드립니다. title: Rubidium ion hydration in ambient and supercritical water J. L. Fulton, D. M. Pfund, and S. L. Wallen Material and Chemical Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352 M. Newville, E. A. Stern, and Yanjun Ma Department of Physics, Box 351560, University of Washington, Seattle, Washington 98195 (Received 4 March 1996; accepted 2 May 1996) X-ray absorption fine structure (XAFS) measurements and analyses are presented for Rb + in supercritical water solutions. The structure of the first hydration shell at ambient conditions is compared to that in the supercritical region at a temperature of 424 °C and pressures from 382 to 633 bar. For all reported studies, RbBr at a concentration of 0.5 molal was used. XAFS results show that there is a well-defined hydration shell around the cation even at 424 °C but at these high temperatures the extent of hydration of the Rb cation is reduced by about 40%. A slight contraction of this first shell distance by about 0.10 Å is also observed under supercritical conditions. The reduction in the number of water-ion bonds is analogous to the reduction in the amount of water–water hydrogen bonding that has been observed by others under supercritical conditions. The reduction in waters-of-hydration under supercritical conditions may also be in part due to formation of contact-ion pairs. ©1996 American Institute of Physics. >M. Ue, K. Shima, and S. Mori, Electrochim. Acta, 39, 2751 (1994) >J.L.Fulton, D.M. Pfund, S.L. Wallen, M. Newville, E.A. Stern, Y. Ma, J. Chem. >Phys. 105, 2161(1996) >