p_cx_1_3_adas Function

  1. atomic_tables.f90
  2. atomic_tables
  3. p_cx_1_3_adas

public function p_cx_1_3_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

TypeIntentOptionalAttributesName
real(kind=Float64), intent(in) :: Erel

Relative collision energy [keV/amu]

Return Value real(kind=Float64)

Cross Section []


Called by

proc~~p_cx_1_3_adas~~CalledByGraph proc~p_cx_1_3_adas p_cx_1_3_adas proc~p_cx_1 p_cx_1 proc~p_cx_1->proc~p_cx_1_3_adas proc~p_cx_3 p_cx_3 proc~p_cx_3->proc~p_cx_1_3_adas proc~p_cx_3->proc~p_cx_1 proc~p_cx_n p_cx_n proc~p_cx_n->proc~p_cx_1 proc~p_cx_n->proc~p_cx_3 proc~p_cx_n_m p_cx_n_m proc~p_cx_n_m->proc~p_cx_n proc~p_cx p_cx proc~p_cx->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_1_3_adas

Source Code

function p_cx_1_3_adas(Erel) result(sigma)
    !+Calculates cross section for a proton-Hydrogen charge exchange interaction
    !+from the \(n=1\) state to the \(m=3\) state at energy `Erel`
    !+
    !+###Equation
    !+ $$H^+ + H(1) \rightarrow H(3) + H^+$$
    !+###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(10), parameter :: a = [7.037287586d4, -1.479161477d5, &
                                                    1.370120708d5, -7.343180122d4, &
                                                    2.509832081d4, -5.674317075d3, &
                                                    8.487767749d2, -8.102284612d1, &
                                                    4.480007503d0, -1.093512342d-1 ]
    real(Float64) :: e, ee, fac, l, p

    e = Erel*1.d3
    if(e.ge.2.d3) then
        ee = max(e,1.0)
        fac = 1.d0
    else
        ee = 2.0d3
        fac = (Erel**(1.4))/2.8
    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 + a(10)*l**9.0

    sigma = max(fac*(10.d0**p),1.d-300)

end function p_cx_1_3_adas