| Process | EEX: Excitation |
| Data type | cross section | uploaded on 2022-05-26 |
| Comment | Analytic fits for electron-impact excitation collision strengths for BeI as a function of energy in terms of threshold |
| Recommended | Yes |
| Method | Theory |
| Columns |
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| Threshold | 1.03687 eV |
| Uncertainty | 15 % |
| Data | Download (data from fit) |
| Fit Function Details |
\[\Omega (x) = \left( \frac{x (x - 1)}{x^2 + A_1} \right) \left(A_2 + \frac{A_3}{x} + \frac{A_4}{x^2} + \frac{A_5}{x^3} + \frac{A_6}{x^4}\right)\] | ||||||||||||
| Python | def DF_fit_Be(x, A1, A2, A3, A4, A5, A6):
"""
This function calculates the dimensionless collision strengths for electron
impact excitation of BeI.
param x: requested electron-impact energy in threshold units
type x: float, np.ndarray
param Ai: fit coefficients
type Ai: float
"""
Omega = (x*(x-1)/(x**2 + A1))*(A2 + A3/x + A4/x**2 + A5/x**3 + A6/x**4)
return Omega |
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| Data Type | collision strength | ||||||||||||
| Fit Coefficients |
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| x-range | – |