  Structural and dynamical properties of AsSe4 liquids have been studied by ab
initio molecular dynamics simulations as a function of temperature. Calculated
neutron structure factors are in good agreement with experimental data. Results
show the existence of a significant amount of As-As homopolar bonds and of SeI
and AsIV units which are not part of the picture of the cross-linking
As(Se1/2)3 pyramids usually proposed for the glassy state.
