| Process | HCX: Charge Transfer |
| Data type | cross section | uploaded on 2023-02-08 |
| Comment | Fit function taken from p120. Error: E< 1/(n^2) keV/u -> 60%, 1/(n^2) keV/u<E< 25/(n^2) keV/u -> 40%, 25/(n^2) keV/u<E< 200/(n^2) keV/u -> 30%, E>200/(n^2) keV/u -> 20% |
| Method | semi-empirical |
| Frame | Target |
| Columns |
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| Data | Download (data from fit) |
| Fit Function Details |
\[\sigma_{CX}^{n>2}(E) = A_5^4 \frac{7.04 \times 10^{-16} A_1 \bigg[1 - e^{-\frac{4}{3A_1}\big(1 + \tilde E^{A_2} + A_3 \tilde E^{3.5} + A_4 \tilde E^{5.4}\big) } \bigg]}{1 + \tilde E^{A_2} + A_3 \tilde E^{3.5} + A_4 \tilde E^{5.4}}, \tilde E = EA_5^2\] | ||||||||||
| Python | def h_hcx_javen_he_scaled(E, A1, A2, A3, A4, A5):
"""
This function calculates He+2 impact charge exchange cross sections (in cm2) of
H n > 2
param E: requested impact energy in keV/u
type E: float, np.ndarray
param Ai: fit coefficient
type Ai: float
"""
E = E/A[4]**2
sigma = 7.04e-16*A5**4*A1*(1-np.exp(-4/(3*A1)*
1+E**A2+A3*E**3.5+A4*E**5.4)))/(1+E**A2+A3*E**3.5+A4*E**5.4)
return sigma |
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| Fit Precision | 2.4 % | ||||||||||
| Fit Coefficients |
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| x-range | – |