Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
A time dependent density functional treatment of superfluid dynamics: Equilibration of the electron bubble in superfluid 4
 

Summary: A time dependent density functional treatment of superfluid dynamics:
Equilibration of the electron bubble in superfluid 4
He
J. Elorantaa)
and V. A. Apkarianb)
Department of Chemistry, University of California, Irvine, California 92697
Received 24 July 2002; accepted 19 September 2002
Time dependent density functionals are formulated and implemented in numerical simulations of the
equilibration dynamics of an excess electron in superfluid helium. Previously developed density
functionals that incorporate nonlocal potential and kinetic correlations and reproduce the dispersion
curve of liquid 4
He, are used. The electron­helium interaction is treated using pseudopotentials,
after testing their accuracy in reproducing the static properties of the solvated electron bubble
through its known spectroscopy. The dynamics initiated by the sudden compression of the bubble is
dissected, and the results are favorably compared to classical hydrodynamics. In the near-field, the
fast motion corresponds to interfacial compressional waves, followed by the slow breathing of the
cavity. The far-field motion consists of a shock wave, followed by radiating sound waves. The
solitonic shock wave propagates at speeds as high as 580 m/s, determined by the amplitude of
excitation. The energy carried by the shock front ensures that the subsequent bubble dynamics
occurs in the linear response regime. Dissipation occurs through radiation of sound during the

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry