Catalysis of condensation of metal nanoparticies ablated in the superfluid helium by quantized vortices

摘要

Coagulation of the products of metal ablation by pulsed laser inside superfluid helium is significantly different from that for all other liquids. This is mainly a consequence of two specific features of He II. The first is that quasi 1-D quantized vortices appeared in He II serve as the centers of condensation for any particles suspended in the fluid. The second is a highly nonlinear character of heat transfer in superfluid helium-up to heat flux of 10 W/cm2 it is the best existing heat-conducting material, but at larger fluxes it transforms into a good heat-insulating substance. The combination of these peculiarities leads to existence of two different regimes of metal condensation.