Technical

• The implementation is based upon a highly optimized numerical integration scheme for the evaluation
  of matrix elements of the Fock operator, property integrals involving the charge density, etc.
  The code has been vectorized and parallelized.
• Basis functions are Slater-Type Orbitals (STOs).
  A database is available with several basis sets for each atom in the periodic table of elements.
• The Coulomb potential is evaluated via an accurate fitting of the charge density with so-called
  fit functions, which are Slater-type exponential functions centered on the atoms.
  The fit functions are included in the database files.
• A frozen core facility is provided for an efficient treatment of the inner atomic shells.
• Extensive use is made of point group symmetry.
  Most of the commonly encountered symmetry groups are available.
• Linear scaling techniques are used to speed up calculations on large molecules