SCF
openLOWDIN has different multicomponent SCF schemes to minimise the energy of a molecular system composed of multiple quantum species. The most notable is a simultaneous approach as:
Schematic of simultaneous global SCF convergence algorithm, adapted from [2]
nonElectronicEnergyTolerance=[float] Default1.0E-8electronicEnergyTolerance=[float] Default1.0E-8nonelectronicDensityMatrixTolerance=[float] Default1.0E-6electronicDensityMatrixTolerance=[float] Default1.0E-6totalEnergyTolerance=[float] Default1.0E-8totalDensityMatrixTolerance=[float] Default1.0E-6densityFactorThreshold=[float] Default1.0E-8diisSwitchThreshold=[float] Default0.5diisSwitchThreshold_bkp=[float] Default0.5electronicLevelShifting=[integer] Default0.0nonelectronicLevelShifting=[integer] Default0.0exchangeOrbitalThreshold=[float] Default0.8waveFunctionScale=[integer] Default1000.0scfNonelectronicMaxIterations=[integer] Default50scfElectronicMaxIterations=[integer] Default50scfGlobalMaxIterations=[integer] Default200listSize=[integer] Default-20convergenceMethod=[character] Default1!!(0)NONE,(1)DAMPING,(2)DIIS,(3)LEVELSHIFTING(4)DAMPING/DIISdiisDimensionality=[integer] Default10iterationScheme=[character] Default3!!(0)NONELECRONICFULLY/e-(1)ELECTRONICFULLY(2)CONVERGEDINDIVIDIALLY(3)SCHEMESIMULTANEOUSscfElectronicTypeGuess=[character] Default"HCORE"scfNonelectronicTypeGuess=[character] Default"HCORE"scfConvergenceCriterium=[character] Default"ENERGY"!ENERGY,DENSITY,BOTHdiisErrorInDamping=[logical] Default.false.activateLevelShifting=[logical] Default.false.exchangeOrbitalsInSCF=[logical] Default.false.forceClosedShell=[logical] Default.false.debugScfs=[logical] Default.false.scfGhostSpecies=[character] Default"NONE"