Abstract
Evaporation and condensation of the mixed $^{3}\mathrm{He}$-$^{4}\mathrm{He}$ system ($0<{X}_{l}<0.21$) were studied at 1.58\ifmmode^\circ\else\textdegree\fi{}K using the heat-pulse technique. The evaporation efficiency increased linearly, while the condensation efficiency decreased, with increasing $^{3}\mathrm{He}$ concentration in the liquid. Analysis based on a weak-coupling model of the surface state with the bulk excitations as an evaporation and condensation mechanism gave information on the $^{3}\mathrm{He}$ trapped surface state which agrees with the surface-tension measurements. In addition, the results seem to suggest that accumulation of surface $^{3}\mathrm{He}$ does not essentially affect the evaporation of $^{4}\mathrm{He}$ atoms in the $^{3}\mathrm{He}$-$^{4}\mathrm{He}$ mixture.
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