p_cx_3_4_adas Function

  1. atomic_tables.f90
  2. atomic_tables
  3. p_cx_3_4_adas

public function p_cx_3_4_adas(Erel) result(sigma)

Calculates cross section for a proton-Hydrogen charge exchange interaction from the state to the state at energy Erel

Equation

References

Arguments

Type IntentOptional AttributesName
real(kind=Float64), intent(in) :: Erel

Relative collision energy [keV/amu]

Return Value real(kind=Float64)

Cross Section []


Called by

proc~~p_cx_3_4_adas~~CalledByGraph proc~p_cx_3_4_adas p_cx_3_4_adas proc~p_cx_n p_cx_n proc~p_cx_n->proc~p_cx_3_4_adas proc~p_cx_3 p_cx_3 proc~p_cx_n->proc~p_cx_3 proc~p_cx_3->proc~p_cx_3_4_adas proc~p_cx p_cx proc~p_cx->proc~p_cx_n proc~p_cx_n_m p_cx_n_m proc~p_cx_n_m->proc~p_cx_n proc~write_bb_h_h write_bb_H_H proc~write_bb_h_h->proc~p_cx program~generate_tables generate_tables program~generate_tables->proc~write_bb_h_h

Contents

Source Code

p_cx_3_4_adas

Source Code

function p_cx_3_4_adas(Erel) result(sigma)
    !+Calculates cross section for a proton-Hydrogen charge exchange interaction
    !+from the \(n=3\) state to the \(m=4\) state at energy `Erel`
    !+
    !+###Equation
    !+ $$H^+ + H(3) \rightarrow H(4) + H^+$$
    !+###References
    !+* Ref. 4 [[atomic_tables(module)]]
    real(Float64), intent(in) :: Erel
        !+ Relative collision energy [keV/amu]
    real(Float64)             :: sigma
        !+ Cross Section [\(cm^2\)]

    real(Float64), dimension(9), parameter :: a = [ 1.705303425d4,-3.316878090d4, &
                                                    2.792556433d4,-1.330264490d4, &
                                                    3.921666688d3,-7.327555138d2, &
                                                    8.476342861d1,-5.551987930d0, &
                                                    1.577120745d-1 ]
    real(Float64), parameter :: n = 3.0
    real(Float64) :: ee, fac, l, p

    if(Erel.lt.90.0) then
        ee = max(Erel * 1.d3 * n**2.0, 1.d3) !keV to eV
        fac = 1.d0
    else
        ee = 90.0 * 1.d3 * n**2.0
        fac = 0.82d16 *(Erel*n**2.0)**(-5.5)
    endif

    l = log10(ee)

    p = a(1) + a(2)*l + a(3)*l**2.0 + a(4)*l**3.0 + &
        a(5)*l**4.0   + a(6)*l**5.0 + a(7)*l**6.0 + &
        a(8)*l**7.0   + a(9)*l**8.0

    sigma = fac*(10.d0**p)

end function p_cx_3_4_adas