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subroutine nearly (numpass)
c******************************************************************************
c This routine calculates the quantity 'kapnu0' for each line and
c each tau; this is the line opacity at line center. When kapnu0 is
c multiplied by the voigt function, one gets the line opacity at an
c arbitrary wavelength. Then, the Doppler factor 'dopp' and damping
c parameter 'a' are also computed ('a' is done in a call to another
c routine
c******************************************************************************
implicit real*8 (a-h,o-z)
include 'Atmos.com'
include 'Quants.com'
include 'Linex.com'
include 'Factor.com'
include 'Mol.com'
include 'Dummy.com'
real*8 xnum(100)
integer numpass
equivalence (xnum,dummy1)
c*****load in data for damping factors to be computed from the data
c of Barklem, if desired
if (numpass.eq.1 .and. dampingopt.eq.1) call gammabark
c*****Locate the atmosphere level where taulam is near 0.5
if (numpass.eq.1 .or. numpass.eq.3) then
call opacit (2,wave1(1))
do i=1,ntau
if (taulam(i) .ge. 0.5) go to 180
enddo
180 jtau5 = i
endif
c*****if reading in a new line list, do all lines (numpass=1);
c if iterating "abfind" on a species affected by mol. eq.,
c do just that species (numpass=2); if doing a fake line, or
c maybe one line for a special purpose, do just the first line
c in the "list" (numpass=3)
if (numpass .eq. 1) then
j1 = 1
j2 = nlines + nstrong
elseif (numpass .eq. 2) then
j1 = lim1line
j2 = lim2line
elseif (numpass .eq. 3) then
j1 = 1
j2 = 1
endif
c*****now make the calculations: set up some parameters
do j=j1,j2
ich = idint(charge(j) + 0.1)
iatom = atom1(j) + 0.0001
factoriso = 1.0
c*****compute the Doppler factors
if (numpass.eq.1 .or. numpass.eq.3) then
do i=1,ntau
dopp(j,i) = dsqrt(1.6631d8*t(i)/amass(j)+vturb(i)**2)
enddo
c*****compute damping parameters in a separate routine
call damping (j)
endif
c*****either: compute lower state number densities for atomic lines;
c q21 is the ion/neutral ratio, etc., and q is the ratio of the total
c to the species of interest; do the Saha equation first, then
c the Boltzmann equation
if (iatom .lt. 100) then
do i=1,ntau
q21 = 4.825d15*u(iatom,2,i)/(u(iatom,1,i)*ne(i))*
. t(i)**1.5*dexp(-chi(j,1)/tkev(i))
q32 = 4.825d15*u(iatom,3,i)/(u(iatom,2,i)*ne(i))*
. t(i)**1.5*dexp(-chi(j,2)/tkev(i))
q43 = 4.825d15*u(iatom,4,i)/(u(iatom,3,i)*ne(i))*
. t(i)**1.5*dexp(-chi(j,3)/tkev(i))
if (neq .ne. 0) then
do n=1,neq
if (iatom .eq. iorder(n)) then
xxnum = xamol(n,i)
if (ich .eq. 1) then
q = 1.0
elseif (ich .eq. 2) then
q = 1.0/q21
elseif (ich .eq. 3) then
q = 1.0/(q21*q32) + 1.0/q32 + 1.0 + q43
endif
xnum(i) = xxnum/q*dexp(-e(j,1)/tkev(i))/
. u(iatom,ich,i)
endif
enddo
endif
if (ich .eq. 1) then
q = 1.0 + q21 + q32*q21 + q43*q32*q21
elseif (ich .eq. 2) then
q = 1.0/q21 + 1.0 + q32 + q43*q32
elseif (ich .eq. 3) then
q = 1.0/(q21*q32) + 1.0/q32 + 1.0 + q43
endif
if (control .eq. 'abandy') then
xxab = xabund(iatom)*10**deltaabund
else
xxab = xabund(iatom)
endif
xnum(i) = xxab*nhtot(i)/q*
. dexp(-e(j,1)/tkev(i))/u(iatom,ich,i)
enddo
c*****or: compute lower state number densities for molecular lines
elseif (iatom .lt. 10000) then
call sunder(atom1(j),iaa,ibb)
do n=1,neq
if(iorder(n) .eq. iaa) ia = n
if(iorder(n) .eq. ibb) ib = n
enddo
do i=1,ntau
psipri =
. 1.38065d-16*t(i)*10.0**(d0(j)*theta(i)-13.670)*
. theta(i)**2.5/
. (rdmass(j)**1.5*u(iaa,1,i)*u(ibb,1,i))
xnum(i) = dexp(-e(j,1)/tkev(i))*psipri*
. xamol(ia,i)*xamol(ib,i)
enddo
else
if (iatom .eq. 10108) then
do i=1,ntau
xnum(i) = xnh2o(i)/uh2o(i)*dexp(-e(j,1)/tkev(i))
enddo
elseif (iatom .eq. 60808) then
do i=1,ntau
xnum(i) = xnco2(i)/uco2(i)*dexp(-e(j,1)/tkev(i))
enddo
else
write (*,1001) iatom
stop
endif
endif
c*****finally, compute line opacities at line centers
if (atom1(j)-float(iatom) .ge. 0.0) then
do n=1,numiso
if (atom1(j) .eq. isotope(n)) then
factoriso = isoabund(n,isorun)
endif
enddo
endif
do i=1,ntau
kapnu0(j,i) = 2.65386d-2*xnum(i)*gf(j)*wave1(j)*1.0d-8/
. dopp(j,i)*(1.0-dexp(-1.43879d8/
. (wave1(j)*t(i))))/factoriso
enddo
strength(j) = kapnu0(j,jtau5)
enddo
c*****output regular line information, and strong line information
c if appropriate; exit routine normally
if (numpass.eq.1 .or. numpass.eq.3) then
if (linprintopt .ge. 0) then
if (dostrong .gt. 0) call lineinfo (2)
call lineinfo (1)
endif
endif
return
c*****format statements
1001 format (i6, 'IS NOT AN ALLOWED TRIATOMIC (H_2O AND CO_2);',
. ' I QUIT!')
end
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