| Process | HIN: Ionization |
| Data type | cross section | uploaded on 2023-02-08 |
| Comment | Fit function taken from p112. Error: E< 10/n^2keV/u -> 100%, 10/n^2 keV/u<E< 100/n^2keV/u -> 40%, 100/n^2 keV/u<E<1000/n^2 keV/u -> 30%, E<1000/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 |
\[\sigma_{ion}^{1,2,3}(E) =\Bigg( \frac{A_9}{3}\Bigg)^410^{-16}A_1 \Bigg[\frac{e^{-\frac{A_2}{E_n}}\ln(1+A_3E_n)}{E_n} + \frac{A_4e^{-A_5E_n}}{E_n^{A_6} + A_7E_n^{A_8}}\Bigg]; E_n = \Bigg( \frac{3}{n}\Bigg)^2E\] | ||||||||||||||||||
| Python | def h_hin_javen_he_scaled(E, A1, A2, A3, A4, A5, A6, A7, A8, A9):
"""
This function calculates He+2 impact ionzation cross sections (in cm2) of
H n > 3.
param E: requested impact energy in keV/u
type E: float, np.ndarray
param Ai: fit coefficient
type Ai: float
"""
E = (A9/3)**2*E
sigma = (A9/3)**4*1e-16 * A1 * (np.exp(-A2/E) * np.log(1 + A3*E) / E +
A4*np.exp(-A5*E)/ (E**A6 + A7*E**A8))
return sigma |
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| Fit Precision | 2.1 % | ||||||||||||||||||
| Fit Coefficients |
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| x-range | – |