h_eex_janev_15
Fit Function | \[\sigma_{ex}^{n=1 \rightarrow 3,4,5} = \frac{5.984 \times 10^{-16}}{I X} \Bigg[ \frac{E - I}{E}\Bigg]^{A_6} \Bigg[ \sum_{j=1}^4 \frac{A_j}{X^{j-1}} + A_5\ln X \Bigg], X = \frac{E}{I}\] |
Comments | Python code requires NumPy imported as `np`. |
Arguments |
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Return values |
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Code | def h_eex_janev_15(E, A1, A2, A3, A4, A5, A6, I): """ This function calculates electron impact excitation cross sections (in cm2) of H n=1 to n=3, 4, 5 and n=2 to n=3 param E: requested electron-impact energy in eV type E: float, np.ndarray param Ai: fit coefficient type Ai: float param I: threshold energy in eV type I: float """ sigma = 5.984e-16/E*((E-I)/E)**A6*(A1/(E/I)**0+A2/(E/I)**1+A3/(E/I)**2 + A4/(E/I)**3+A5*np.log(E/I)) return sigma |