| Process | HEX: Excitation |
| Data type | cross section | uploaded on 2023-02-08 |
| Comment | Fit function taken from p86. Error: E<0.5keV/u -> 100%, 0.5keV/u<E<2keV/u -> 60%, 2keV/u<E<15keV/u -> 30%, 15keV/u<E<200keV/u -> 20%, E<200keV/u -> 15% |
| Method | semi-empirical |
| Frame | Target |
| Columns |
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| Ref |
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| Data | Download (data from fit) |
| Fit Function Details |
\[\sigma_{ex}^{1\rightarrow 2}(E)=10^{-16}A_1 \Bigg[\frac{e^{-\frac{A_2}{E}}\ln(1+A_3E)}{E} + \frac{A_4e^{-A_5E}}{E^{A_6}} + \frac{A_7e^{-\frac{A_8}{E}}}{1+A_9E^{A_{10}}}\Bigg]\] | ||||||||||||||||||||
| Python | def h_hex_janev_12(E, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10):
"""
This function calculates proton impact excitation cross sections (in cm2) of
H n=1 to n=2 and He+2 impact excitation of H n=1 to n=2,3,4.
param E: requested impact energy in keV/u
type E: float, np.ndarray
param Ai: fit coefficient
type Ai: float
"""
sigma = 1e-16 * A1 * (np.exp(-A2/E) * np.log(1 + A3*E) / E + A4*np.exp(-A5*E)/E**A6 +
A7*np.exp(-A8/E)/(1+A9*E**A10))
return sigma |
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| Fit Precision | 2.0 % | ||||||||||||||||||||
| Fit Coefficients |
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| x-range | – |