p_excit_1_2_janev Function

  1. atomic_tables.f90
  2. atomic_tables
  3. p_excit_1_2_janev

public function p_excit_1_2_janev(eb) result(sigma)

Calculates cross section for a proton-Hydrogen impact excitation transition from the state to the state at energy eb

Equation

References

Arguments

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

Relative collision energy [keV/amu]

Return Value real(kind=Float64)

Cross Section []


Called by

proc~~p_excit_1_2_janev~~CalledByGraph proc~p_excit_1_2_janev p_excit_1_2_janev proc~p_excit_1_janev p_excit_1_janev proc~p_excit_1_janev->proc~p_excit_1_2_janev proc~p_excit_n p_excit_n proc~p_excit_n->proc~p_excit_1_janev proc~p_excit_n_m p_excit_n_m proc~p_excit_n_m->proc~p_excit_n proc~p_excit p_excit proc~p_excit->proc~p_excit_n proc~write_bb_h_h write_bb_H_H proc~write_bb_h_h->proc~p_excit program~generate_tables generate_tables program~generate_tables->proc~write_bb_h_h

Contents

Source Code

p_excit_1_2_janev

Source Code

function p_excit_1_2_janev(eb) result(sigma)
    !+Calculates cross section for a proton-Hydrogen impact excitation transition from
    !+the \(n=1\) state to the \(m=2\) state at energy `eb`
    !+
    !+###Equation
    !+$$ H^+ + H(1) \rightarrow H^+ + H(2) $$
    !+
    !+###References
    !+* Eq. 29.b and Table 4 in Ref. 2 [[atomic_tables(module)]]
    !+
    real(Float64), intent(in) :: eb
        !+ Relative collision energy [keV/amu]
    real(Float64)             :: sigma
        !+ Cross Section [\(cm^2\)]
    real(Float64), dimension(10), parameter :: a = [34.433d0, 8.5476d0,  &
                                                    7.8501d0, -9.2217d0, &
                                                    1.8020d-2, 1.6931d0, &
                                                    1.9422d-3, 2.9068d0, &
                                                    44.507d0, 0.56870d0 ]
        !+ Fitting parameters from Table 4 in Ref. 2

    sigma = 1.d-16 * a(1) * ( a(2)*exp(-a(3)*eb)/(eb**a(4)) + &
                     a(5)*exp(-a(6)/eb)/(1.+a(7)*eb**a(8))  + &
                     exp(-a(9)/eb)*log(1.+a(10)*eb)/eb )

end function p_excit_1_2_janev