distance.f

计算STM诱导金属表面等离激元发光的程序

	subroutine distance(curcom,dist)
	implicit none
	real*8 current,currenta,currentb,bbmin,fi
	real*8 current0,currentest,a,d,bohr,pi
	real*8 curcom,dist,dista,distb,distest,dif,coc
        common/sph/a(10),d
	common/hyperb/bbmin,fi
	data bohr/0.529177d0/
	data pi/3.14159265358979d0/
	current0=curcom*1.d-9
	dista=3.d0/bohr
	distb=40.d0/bohr
90	d=dista-bbmin
	currenta=current(0.d0,0.d0)
	d=distb-bbmin
	currentb=current(0.d0,0.d0)
	distest=(distb+dista)/2.d0
	write(6,*)dista*bohr,distb*bohr,distest*bohr
	d=distest-bbmin
	currentest=current(0.d0,0.d0)
	write(6,*)currentest
	dif=current0-currentest
	coc=dif/current0
	if(dabs(coc).lt.1.d-4) goto 100
	if(dif.gt.0.d0) then
	distb=distest
	else
	dista=distest
	endif
	goto 90
100     dist=distest*bohr
	write(6,*)'Convergence achieved'
	return
	end