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caleng_tip4p_gg_iso.f
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caleng_tip4p_gg_iso.f
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c ==================================================
subroutine caleng_iso(com_1, com_2, E_2H2O,
+ Eulang_1, Eulang_2)
c ==================================================
c Initially:
c __________________________________________________
c this subroutine calculates TIP4P potential between
c two rigid waters given the coordinates
c of their centres of mass and
c their respective Euler angles
c e: com1, com2, rotmat1, rotmat2
c ROwf, R1wf, R2wf, RMwf
c s: E2H2O
c __________________________________________________
c GG (Jan. 20th 2011): -----> H2O ---- H2O TIP4P
c __________________________________________________
c rotmat_1, rotmat_2 computed within the code with
c Eulang_1, Eulang_2
c ROwf, RH1wf, RH2wf, RMwf put as data
c e: com_1, com_2, Eulang_1, Eulang_2
c s: E_2H2O
implicit double precision(a-h,o-z)
parameter(zero=0.d0)
dimension ROwf(3), RH1wf(3), RH2wf(3), RMwf(3),
+ com_1(3), com_2(3), Eulang_1(3),
+ Eulang_2(3), RO_1_sf(3), RO_2_sf(3),
+ RH1_1_sf(3), RH1_2_sf(3),
+ RH2_1_sf(3), RH2_2_sf(3),
+ RM_1_sf(3), RM_2_sf(3), vec(3),
+ rotmat_2(3,3), rotmat_1(3,3),
+ crossA(3), crossB(3)
c TIP4P parameters (L-J) & conversion factors:
parameter(epsoo=0.154875717017208413d0,sigoo=3.15365d0,
+ qo=0.d0,qm=-1.04d0,qh=0.520d0,
+ br2ang=0.52917721092d0,hr2kcl=627.509469d0,
+ hr2k=3.1577465d5,kcal2k=503.218978939d0)
data ROwf/zero,zero,0.06562d0/,RH1wf/0.7557d0,zero,-0.5223d0/,
+ RH2wf/-0.7557d0,zero,-0.5223d0/,
+ RMwf/0.d0,0.d0,-0.08438d0/
c
c print*,'com_1',(com_1(i),i=1,3)
c print*,'com_2',(com_2(i),i=1,3)
c prepare rotational matrix for water 1
c obtain the SFF coordinates for H1, H2, and O of water 1
call matpre(Eulang_1, rotmat_1)
do i=1,3
RO_1_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat_1, 3, ROwf, 1, 1.d0, RO_1_sf, 1 )
call rottrn(rotmat_1, ROwf, RO_1_sf, com_1)
c
do i=1,3
RM_1_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat_1, 3, ROwf, 1, 1.d0, RO_1_sf, 1 )
call rottrn(rotmat_1, RMwf, RM_1_sf, com_1)
do i=1,3
RH1_1_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat_1, 3, R1wf, 1, 1.d0, R1_1_sf, 1 )
call rottrn(rotmat_1, RH1wf, RH1_1_sf, com_1)
c
do i=1,3
RH2_1_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat1, 3, R2wf, 1, 1.d0, R21sf, 1 )
call rottrn(rotmat_1, RH2wf, RH2_1_sf, com_1)
c
c prepare rotational matrix for water 2
c obtain the SFF coordinates for H1, H2, and O of water 2
call matpre(Eulang_2, rotmat_2)
do i=1,3
RO_2_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat_2, 3, ROwf, 1, 1.d0, RO_2_sf, 1 )
call rottrn(rotmat_2, ROwf, RO_2_sf, com_2)
c
do i=1,3
RM_2_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat_2, 3, ROwf, 1, 1.d0, RO_2_sf, 1 )
call rottrn(rotmat_2, RMwf, RM_2_sf, com_2)
c call rottrn(rotmat2,R1wf,R12sf,com2)
do i=1,3
RH1_2_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat2, 3, R1wf, 1, 1.d0, R12sf, 1 )
call rottrn(rotmat_2, RH1wf, RH1_2_sf, com_2)
c
c call rottrn(rotmat2,R2wf,R22sf,com2)
do i=1,3
RH2_2_sf(i)=0.d0
enddo
c call DGEMV ('N', 3, 3, 1.d0, rotmat2, 3, R2wf, 1, 1.d0, R22sf, 1 )
call rottrn(rotmat_2, RH2wf, RH2_2_sf, com_2)
c
c
c ... calculate water dimer energies through SPC/WF formula
E_2H2O=0.d0
c ... O-O interaction
roo=0.0d0
rmm=0.0d0
do i=1,3
roo=roo+(RO_1_sf(i)-RO_2_sf(i))*(RO_1_sf(i)-RO_2_sf(i))
rmm=rmm+(RM_1_sf(i)-RM_2_sf(i))*(RM_1_sf(i)-RM_2_sf(i))
enddo
rmm=dsqrt(rmm)
roo4=roo*roo
roo6=roo4*roo
roo12=roo6*roo6
roo=dsqrt(roo)
c AMBER values:
c A_param=5.99896595E+05
c B_param=6.09865468E+02
c SPC values:
c A_param=6.25d5
c B_param=6.10.d0
c TIP4P values:
A_param=6.d5
B_param=610.d0
v_o2lj=A_param/roo12-B_param/roo6
c ... H-O, H-H and O-O Columbic interaction
rho1=zero
rho2=zero
rho3=zero
rho4=zero
rhm1=zero
rhm2=zero
rhm3=zero
rhm4=zero
rhh1=zero
rhh2=zero
rhh3=zero
rhh4=zero
do i=1,3
rho1=rho1+(RO_1_sf(i)-RH1_2_sf(i))*(RO_1_sf(i)-RH1_2_sf(i))
rho2=rho2+(RO_1_sf(i)-RH2_2_sf(i))*(RO_1_sf(i)-RH2_2_sf(i))
rho3=rho3+(RO_2_sf(i)-RH1_1_sf(i))*(RO_2_sf(i)-RH1_1_sf(i))
rho4=rho4+(RO_2_sf(i)-RH2_1_sf(i))*(RO_2_sf(i)-RH2_1_sf(i))
c
rhm1=rhm1+(RM_1_sf(i)-RH1_2_sf(i))*(RM_1_sf(i)-RH1_2_sf(i))
rhm2=rhm2+(RM_1_sf(i)-RH2_2_sf(i))*(RM_1_sf(i)-RH2_2_sf(i))
rhm3=rhm3+(RM_2_sf(i)-RH1_1_sf(i))*(RM_2_sf(i)-RH1_1_sf(i))
rhm4=rhm4+(RM_2_sf(i)-RH2_1_sf(i))*(RM_2_sf(i)-RH2_1_sf(i))
c
rhh1=rhh1+(RH1_1_sf(i)-RH1_2_sf(i))*(RH1_1_sf(i)-RH1_2_sf(i))
rhh2=rhh2+(RH1_1_sf(i)-RH2_2_sf(i))*(RH1_1_sf(i)-RH2_2_sf(i))
rhh3=rhh3+(RH2_1_sf(i)-RH1_2_sf(i))*(RH2_1_sf(i)-RH1_2_sf(i))
rhh4=rhh4+(RH2_1_sf(i)-RH2_2_sf(i))*(RH2_1_sf(i)-RH2_2_sf(i))
enddo
rho1=dsqrt(rho1)
rho2=dsqrt(rho2)
rho3=dsqrt(rho3)
rho4=dsqrt(rho4)
rhm1=dsqrt(rhm1)
rhm2=dsqrt(rhm2)
rhm3=dsqrt(rhm3)
rhm4=dsqrt(rhm4)
rhh1=dsqrt(rhh1)
rhh2=dsqrt(rhh2)
rhh3=dsqrt(rhh3)
rhh4=dsqrt(rhh4)
c print*,'rho1 rho2 rho3 rho4',rho1, rho2, rho3, rho4
c print*,'rhh1 rhh2 rhh3 rhh4',rhh1, rhh2, rhh3, rhh4
c
c v_ohcolm: coulumbic term between O and H from different H2O in Hartree
v_ohcolm=qo*qh*(1.d0/rho1+1.d0/rho2+1.d0/rho3+1.d0/rho4)
c v_mhcolm: coulumbic term between M and H from different H2O in Hartree
v_mhcolm=qm*qh*(1.d0/rhm1+1.d0/rhm2+1.d0/rhm3+1.d0/rhm4)
c v_hhcolm: ... between H and H ...
v_hhcolm=qh*qh*(1.d0/rhh1+1.d0/rhh2+1.d0/rhh3+1.d0/rhh4)
c v_oocolm: ... between O and O ...
v_oocolm=qo*qo*(1.d0/roo)
c v_mmcolm: ... between M and M ...
v_mmcolm=qm*qm*(1.d0/rmm)
c
E_2H2O=v_o2lj*kcal2k
+ +(v_ohcolm+v_mhcolm+v_oocolm+v_mmcolm+v_hhcolm)*hr2k*br2ang
c print*,'E_2H2O=',E_2H2O
c E_2H2O=zero
c
return
end