Fourier Path Integral Monte Carlo Method for the Calculation of the   Microcanonical Density of States
  Using a Hubbard-Stratonovich transformation coupled with Fourier path integral methods, expressions are derived for the numerical evaluation of the microcanonical density of states for quantum particles obeying Boltzmann statistics. A numerical algorithmis suggested to evaluate the quantum density of states and illustrated on a one-dimensional model system. 
David L. Freeman (Department of Chemistry, The University of Rhode   Island, Kingston, RI) and J.D. Doll (Department of Chem...