Calculates the total charge exchange cross section for a Neutral Hydrogen atom
in the n
state colliding with a ion with charge q
at energy eb
Uses ADAS(Ref. 4) cross sections if available else uses Janev (Ref. 5) cross sections
Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
real(kind=Float64), | intent(in) | :: | eb | Relative collision energy [keV/amu] |
||
integer, | intent(in) | :: | q | Ion charge |
||
integer, | intent(in) | :: | n | Initial atomic energy level/state |
Cross Section []
function Aq_cx_n(eb, q, n) result(sigma)
!+ Calculates the total charge exchange cross section for a Neutral Hydrogen atom
!+in the `n` state colliding with a ion with charge `q` at energy `eb`
!+
!+@note Uses ADAS(Ref. 4) cross sections if available else uses Janev (Ref. 5) cross sections
!+
!+###Equation
!+$$ A^{q+} + H(n) \rightarrow A^{(q-1)+} + H^+, q \gt 3 $$
!+
!+###References
!+* Ref. 4 [[atomic_tables(module)]]
!+* Page 166 in Ref. 5 [[atomic_tables(module)]]
!+* Page 168 in Ref. 5 [[atomic_tables(module)]]
!+* Page 174 in Ref. 5 [[atomic_tables(module)]]
real(Float64), intent(in) :: eb
!+ Relative collision energy [keV/amu]
integer, intent(in) :: q
!+ Ion charge
integer, intent(in) :: n
!+ Initial atomic energy level/state
real(Float64) :: sigma
!+ Cross Section [\(cm^2\)]
sigma = Aq_cx_n_adas(eb, q, n)
if(sigma.eq.0.d0) then
sigma = Aq_cx_n_janev(eb, q, n)
endif
end function Aq_cx_n