mirror of
https://github.com/pfloos/quack
synced 2024-12-25 22:03:44 +01:00
134 lines
4.6 KiB
Fortran
134 lines
4.6 KiB
Fortran
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program eDFT
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! exchange-correlation density-functional theory calculations
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include 'parameters.h'
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integer :: nAt,nBas,nEl(nspin),nO(nspin),nV(nspin)
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double precision :: ENuc,EKS
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double precision,allocatable :: ZNuc(:),rAt(:,:)
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integer :: nShell
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integer,allocatable :: TotAngMomShell(:)
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integer,allocatable :: KShell(:)
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double precision,allocatable :: CenterShell(:,:)
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double precision,allocatable :: DShell(:,:)
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double precision,allocatable :: ExpShell(:,:)
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double precision,allocatable :: S(:,:),T(:,:),V(:,:),Hc(:,:),X(:,:)
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double precision,allocatable :: ERI(:,:,:,:)
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integer :: x_rung,c_rung
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character(len=12) :: x_DFA ,c_DFA
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integer :: SGn
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integer :: nRad,nAng,nGrid
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double precision,allocatable :: root(:,:)
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double precision,allocatable :: weight(:)
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double precision,allocatable :: AO(:,:)
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double precision,allocatable :: dAO(:,:,:)
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double precision :: start_KS,end_KS,t_KS
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integer :: nEns
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double precision,allocatable :: wEns(:)
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integer :: maxSCF,max_diis
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double precision :: thresh
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logical :: DIIS,guess_type,ortho_type
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! Hello World
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write(*,*)
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write(*,*) '******************************************'
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write(*,*) '* eDFT: density-functional for ensembles *'
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write(*,*) '******************************************'
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write(*,*)
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!------------------------------------------------------------------------
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! Read input information
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!------------------------------------------------------------------------
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! Read number of atoms, number of electrons of the system
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! nO = number of occupied orbitals
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! nV = number of virtual orbitals (see below)
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! nBas = number of basis functions (see below)
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! = nO + nV
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call read_molecule(nAt,nEl,nO)
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allocate(ZNuc(nAt),rAt(nAt,ncart))
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! Read geometry
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call read_geometry(nAt,ZNuc,rAt,ENuc)
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allocate(CenterShell(maxShell,ncart),TotAngMomShell(maxShell),KShell(maxShell), &
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DShell(maxShell,maxK),ExpShell(maxShell,maxK))
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!------------------------------------------------------------------------
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! Read basis set information
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!------------------------------------------------------------------------
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call read_basis(nAt,rAt,nBas,nO,nV,nShell,TotAngMomShell,CenterShell,KShell,DShell,ExpShell)
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!------------------------------------------------------------------------
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! Read one- and two-electron integrals
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!------------------------------------------------------------------------
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! Memory allocation for one- and two-electron integrals
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allocate(S(nBas,nBas),T(nBas,nBas),V(nBas,nBas),Hc(nBas,nBas),X(nBas,nBas), &
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ERI(nBas,nBas,nBas,nBas))
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! Read integrals
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call read_integrals(nBas,S,T,V,Hc,ERI)
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! Orthogonalization X = S^(-1/2)
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call orthogonalization_matrix(nBas,S,X)
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!------------------------------------------------------------------------
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! DFT options
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!------------------------------------------------------------------------
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! Allocate ensemble weights
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allocate(wEns(maxEns))
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call read_options(x_rung,x_DFA,c_rung,c_DFA,SGn,nEns,wEns,maxSCF,thresh,DIIS,max_diis,guess_type,ortho_type)
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!------------------------------------------------------------------------
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! Construct quadrature grid
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!------------------------------------------------------------------------
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call read_grid(SGn,nRad,nAng,nGrid)
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allocate(root(ncart,nGrid),weight(nGrid))
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call quadrature_grid(nRad,nAng,nGrid,root,weight)
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!------------------------------------------------------------------------
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! Calculate AO values at grid points
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!------------------------------------------------------------------------
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allocate(AO(nBas,nGrid),dAO(ncart,nBas,nGrid))
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call AO_values_grid(nBas,nShell,CenterShell,TotAngMomShell,KShell,DShell,ExpShell, &
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nGrid,root,AO,dAO)
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!------------------------------------------------------------------------
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! Compute KS energy
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!------------------------------------------------------------------------
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call cpu_time(start_KS)
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call Kohn_Sham(x_rung,x_DFA,c_rung,c_DFA,nEns,wEns(1:nEns),nGrid,weight(:),maxSCF,thresh,max_diis,guess_type, &
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nBas,AO(:,:),dAO(:,:,:),nO(:),nV(:),S(:,:),T(:,:),V(:,:),Hc(:,:),ERI(:,:,:,:),X(:,:),ENuc,EKS)
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call cpu_time(end_KS)
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t_KS = end_KS - start_KS
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write(*,'(A65,1X,F9.3,A8)') 'Total CPU time for KS = ',t_KS,' seconds'
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write(*,*)
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!------------------------------------------------------------------------
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! End of eDFT
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!------------------------------------------------------------------------
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end program eDFT
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