| Process | HCX: Charge Transfer |
| Data type | cross section | uploaded on 2023-02-08 |
| Comment | Fit function taken from p80. Error: E< 0.1/n^2 keV/u -> 40%, 0.1/n^2 keV/u < E < 40/n^2 keV/u -> 30%, 40, E< 40/n^2 keV/u -> 20% |
| Method | semi-empirical |
| Frame | Target |
| Columns |
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| Ref |
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| Data | Download (data from fit) |
| Fit Function Details |
\[\sigma_{CX}^{n>1}(E)= \frac{A_7^410^{-16}A_1 \ln \big( \frac{A_2}{\tilde E} + A_6 \big)}{1 + A_3 \tilde E + \big( A_4 \tilde E \big)^{3.5} + \big(A_5 \tilde E \big)^{5.4} }, \tilde E = EA_7^2\] | ||||||||||||||
| Python | def h_hcx_janev_scaled(E, A1, A2, A3, A4, A5, A6, A7):
"""
This function calculates proton impact charge exchange cross sections (in cm2) of
H n>1.
param E: requested electron-impact energy in keV
type E: float, np.ndarray
param Ai: fit coefficient
type Ai: float
"""
e = E*A7**2
sigma = A7**4 * 1e-16 * A1 * np.log(A2/e + A6) /
(1 + A3*e +(A4*e)**3.5 + (A5*e)**5.4)
return sigma |
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| Fit Coefficients |
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| x-range | – |