posted on 25.06.2015, 16:07by F. Aitken, N. Bonifaci, Luis Guillermo Mendoza Luna, Klaus von Haeften
Positively charged helium clusters, also called ‘snowballs’, have been investigated within normal liquid helium. Thermodynamic state equations for ionic helium clusters in liquid helium have been developed, allowing us to discern the ‘hydrodynamic’ radius for a wide range of hydrostatic pressures and temperatures. The mobilities derived from the cluster sizes using stokes law match experimental data with unsurpassed accuracy. For low pressures the compressibility of the cluster ions was found to be distinctly larger than the compressibility of solid helium suggesting that in this pressure range clusters are fully or partially liquid.
K. von Haeften and F.
Aitken acknowledge funding by the British Council through
the Alliance Programme. K. von Haeften is grateful for financial
support through The Leverhulme Trust (Research Grant
F00212AH), the Royal Society (International Exchange Grant
RP16G0679) and the Universite Joseph Fourier for a Visiting ´
Professorship. Luis Guillermo Mendoza Luna acknowledges
financial support from the Mexican Consejo Nacional de Ciencia
y Tecnolog´ıa (CONACYT) Scholarship number 310668,
Physical Chemistry Chemical Physics 2015
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy