| Process | EIN: Ionization |
| Data type | cross section | uploaded on 2024-01-18 |
| Comment | Analytic fits for electron-impact ionization cross sections for Be+. The cross sections calculations take into account of ioinzation of valence electron as well as core 1s electrons. The uncertainty in the original cross sections is 10 %, while the fitted ones have a total uncertainty of 15 %. |
| Recommended | Yes |
| Method | CCC: Convergent close-coupling |
| Columns |
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| Ref |
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| Data | Download |
| Fit Function Details |
\[\sigma (x) = \left( \frac{10^{-13}}{xI} \right) \left(A_1^2 \ln\left( \frac{x}{I} \right) + \displaystyle\sum_{i=2}^{6}A_i\left(1-\frac{I}{x}\right)^{i-1} \right)\] | ||||||||||||
| Python | def Ion_fit_Be1(x A1, A2, A3, A4, A5, A6, I):
"""
This function calculates electron impact ionization cross sections (in cm2) of
Be II.
param x: requested electron-impact energy in eV
type x: float, np.ndarray
param Ai: fit coefficient
type Ai: float
param I: ionization energy in eV
type I: float
"""
sigma = ((1e-13/x/I)*(A1**2 * np.log(x/I) + A2 * (1-(I/x)) + A3 * (1-(I/x))**2
+ A4 * (1-(I/x))**3 + A5 * (1-(I/x))**4 + A6 * (1-(I/x))**5)
return sigma |
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| Data Type | cross section | ||||||||||||
| Fit Coefficients |
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| x-range | – |