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subroutine damping (linnumber)
c******************************************************************************
c This subroutine computes damping 'gamma' factors
c and then Voigt parameters 'a'
c******************************************************************************
implicit real*8 (a-h,o-z)
include 'Atmos.com'
include 'Linex.com'
j = linnumber
iwave = int(wave1(j))
iatom10 = nint(10.*atom1(j))
if (dampnum(j) < 0.) dampnum(j) = 10.**dampnum(j)
c*****for a few lines, explicit detailed broadening terms have
c appeared in the literature, and so do these lines with a
c sepaarate subroutine
if (itru == 0) then
c Ca II
if (iatom10 == 201) then
if (iwave == 8498 .or.
. iwave == 8542 .or.
. iwave == 8662 .or.
. iwave == 3933) then
call trudamp (j)
damptype(j) = 'TRUEgam'
return
endif
c CH
elseif(iatom10 == 1060) then
if (iwave == 3693) then
call trudamp (j)
damptype(j) = 'TRUEgam'
return
endif
c Ca I
elseif (iatom10 == 200) then
if (iwave==6717 .or. iwave==6318
. .or. iwave==6343 .or. iwave==6361) then
call trudamp (j)
damptype(j) = 'TRUEgam'
return
endif
c Ca I autoionization
elseif (iatom10 == 200) then
if (iwave==6318 .or.
. iwave==6343 .or.
. iwave==6361) then
call trudamp (j)
damptype(j) = 'TRUEgam'
return
endif
endif
endif
c*****here are the calculations to set up the damping; for atomic lines
c there are several options:
c dampingopt = 0 and dampnum = 0 --->
c c6 = Unsold formula
c dampingopt = 0 and dampnum < 10^(-15) --->
c c6 = dampnum
c dampingopt = 0 and 10^(-15) < dampnum < 10^(-5) --->
c gamma = dampnum
c dampingopt = 0 and dampnum(i) > 10^(-5) --->
c c6 = (Unsold formula)*dampnum
c dampingopt = 1 --->
c gammav = gamma_Barklem if possible,
c otherwise use dampingopt=0 options
c dampingopt = 2 --->
c c6 = c6_Blackwell-group
c dampingopt = 3 and dampnum <= 10^(-10) --->
c c6 = c6_NEXTGEN for H I, He I, H2
c dampingopt = 3 and dampnum > 10^(-10) --->
c c6 = (c6_NEXTGEN for H I, He I, H2)*dampnum
c for molecular lines (lacking a better idea) --->
c c6 done as in dampingopt = 0
c*****these damping calculations are done at each atmosphere level
if (linprintopt > 2) write (nf1out,1001) j, wave1(j)
do i=1,ntau
ich = nint(charge(j))
v1 = dsqrt(2.1175d8*t(i)*(1.0/amass(j)+1.008))
c*****first calculate an Unsold approximation to gamma_VanderWaals
if (atom1(j) > 100.) then
ebreakup = 7.0
else
ebreakup = chi(j,ich)
endif
if (e(j,1)>=ebreakup .or. e(j,2)>=ebreakup) then
unsold = 1.0e-33
else
unsold = dabs(1.61d-33*(13.598*charge(j)/(ebreakup -
. e(j,1)))**2 - 1.61d-33*(13.598*charge(j)/
. (ebreakup-e(j,2)))**2)
endif
c*****dampingopt = 0 or
c*****dampingopt = 1 and no Barklem data
if (dampingopt == 0 .or.
. (dampingopt==1 .and. gambark(j)<0)) then
if (dampnum(j) == 0.0) then
damptype(j) = 'UNSLDc6'
gammav = 17.0*unsold**0.4*v1**0.6*numdens(1,1,i)
elseif (dampnum(j) < 1.0d-15) then
damptype(j) = ' MYc6'
gammav = 17.0*dampnum(j)**0.4*v1**0.6*numdens(1,1,i)
elseif (dampnum(j) < 1.0d-04) then
damptype(j) = 'MYgamma'
gammav = dampnum(j)*(t(i)/10000.)**0.3*numdens(1,1,i)
else
damptype(j) = 'MODUNc6'
gammav =
. 17.0*(unsold*dampnum(j))**0.4*v1**0.6*numdens(1,1,i)
endif
c*****dampingopt = 1 with extant Barklem data
elseif (dampingopt==1 .and. gambark(j)>0.) then
damptype(j) = 'BKgamma'
gammav =
. gambark(j)*(t(i)/10000.)**alpbark(j)*numdens(1,1,i)
c*****dampingopt = 2
elseif (dampingopt == 2) then
damptype(j) = 'BLKWLc6'
gammav = 17.0*((1.0 + 0.67*e(j,1))*unsold)**0.4*
. v1**0.6*numdens(1,1,i)
c*****dampingopt = 3
elseif (dampingopt == 3) then
damptype(j) = 'NXTGNc6'
if (dampnum(j) <= 1.0d-10) dampnum(j) = 1.0
c6h = dabs(1.01d-32*(charge(j)**2)*
. (13.598/(ebreakup - e(j,1)))**2 - 1.61d-33*
. (13.598/(ebreakup-e(j,2)))**2)
c6he = dabs((0.204956/0.666793)*1.01d-32*
. (charge(j)**2)*(13.598/(ebreakup -
. e(j,1)))**2 - 1.61d-33*(13.598/(ebreakup-
. e(j,2)))**2)
c6ht = dabs((0.806/0.666793)*1.01d-32*
. (charge(j)**2)*(13.598/(ebreakup -
. e(j,1)))**2 - 1.61d-33*(13.598/(ebreakup-
. e(j,2)))**2)
gammav = 17.0*v1**0.6*(c6h**0.4*numdens(1,1,i) +
. c6he**0.4*numdens(2,1,i) +
. c6ht**0.4*numdens(8,1,i))*dampnum(j)**0.4
endif
c*****compute radiative broadening either by an approximate formula or
c*****the value in Barklem.dat)
if (gamrad(j)/=0.0 .and. dampingopt == 1) then
gammar = gamrad(j)
else
gammar = 2.223d15/wave1(j)**2
endif
c*****now Stark broadening (approximate formulae)
excdiff = chi(j,nint(charge(j))) - e(j,2)
if (excdiff > 0.0 .and. atom1(j)<100.) then
effn2 = 13.6*charge(j)**2/excdiff
else
effn2 = 25.
endif
gammas = 1.0e-8*ne(i)*effn2**2.5
c*****now finish by summing the gammas and computing the Voigt *a* values
gammatot = gammar + gammas + gammav
a(j,i) = gammatot*wave1(j)*1.0d-8/(12.56636*dopp(j,i))
if (linprintopt > 2) write (nf1out,1002) i, gammar,
. gammas, gammav, gammatot, a(j,i)
enddo
return
c*****format statements
1001 format(//' LINE BROADENING PARAMETERS FOR LINE', i4,
. ' AT WAVELENGTH',f8.2/
. ' i',4x,'natural',6x,'Stark',4x,'VdWaals',
. 6x,'total',5x,'a(j,i)')
1002 format (i3,1p5e11.3)
end
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