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論文

The Significance of bromide in the Brust-Schiffrin synthesis of thiol protected gold nanoparticles

Booth, S. G.*; 上原 章寛*; Chang, S.-Y.*; La Fontaine, C.*; 藤井 俊行*; 岡本 芳浩; 今井 崇人*; Schroeder, S. L. M.*; Dryfe, R. A. W.*

Chemical Science, 8(12), p.7954 - 7962, 2017/12

 被引用回数:5 パーセンタイル:44.21(Chemistry, Multidisciplinary)

アルカンチオール保護金粒子の二相ブラスト法合成が、前駆種と反応物質の条件に依存して、異なる経路で進むことを示した。本研究では、反応メカニズムへの臭素の重要性を明白化するために、電気化学的手法とともに、X線吸収スペクトル分析が使用された。解析の結果、前駆体[AuBr$${_4}$$]$${^-}$$について観察された挙動は、これまでの文献に報告された挙動との違いを説明できると考えられた。ここで報告されたメカニズムの理解により、サイズのそろったナノ粒子をより効率的に合成できるようになると期待される。

口頭

Hollow-atom Al X-ray spectra excited by PW laser pulses in foil and CH-buried targets

Pikuz, S. Jr.*; Wagenaars, E.*; Culfa, O.*; Dance, R.*; Rossall, A.*; Tallents, G.*; Faenov, A.*; K$"a$mpfer, T.*; Schulze, K.*; Uschmann, I.*; et al.

no journal, , 

Aluminum K-shell spectra from solid targets were measured during an experiment at Vulcan Petawatt facility. Laser pulses of very high contrast and 150 J of energy allowed interaction studies between the very high intensive laser field and solid state. Intense emission of exotic spectral lines related to the transitions in Al hollow atoms were observed from Al targets. Specifically for 1.5 micron thin foil target the hollow atom yield dominated the resonance line emission. It is suggested that the hollow atoms were predominantly excited by the impact of keV X-ray photons generated on the front surface of the target. On the contrary, the spectra of aluminum foils buried in several microns of CH demonstrated lower K-shell emission and contained much weaker yield of hollow-atom lines. In this case the laser did not interact directly with aluminum matter, so most probably hollow atoms excited by fast electrons penetrating the target.

口頭

Radiation properties of dense matter pumped by X-ray emission of plasma irradiated by laser intensities over 10$$^{20}$$ W/cm$$^{2}$$

Faenov, A.*; Colgan, J.*; Abdallah, J. Jr.*; Pikuz, S. A.*; Wagenaars, E.*; Booth, N.*; Brown, C. R. D.*; Culfa, O.*; Dance, R.*; Evans, R.*; et al.

no journal, , 

It was demonstrated that Hollow ions exotic states of matter, which are very far from equilibrium, can be formed by conventional optical laser technology when the laser intensity reached 10$$^{20}$$ W/cm$$^{2}$$ and approaches to the radiation dominant regime.

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