DataSet D107423

\[\mathrm{e}^- + \mathrm{Li} \; 2p \rightarrow \mathrm{Li}^{+} + 2\mathrm{e}^-\]

Process EIN: Ionization
Data type cross section | uploaded on 2022-11-11
Comment Convergent Close Coupling 45 states. Fit based on equation eq. 2 from Schweinzer et.al.
MethodCCC: Convergent close-coupling
Columns
  1. E /eV
  2. sigma /cm2
Threshold3.543 eV
Uncertainty10 %
Ref
  • B19: J. Schweinzer, R. Brandenburg, I. Bray, R. Hoekstra, F. Aumayr, R. K. Janev, H. P. Winter, "Database for inelastic collisions of lithium atoms with electrons, protons, and multiply charged ions", Atomic Data and Nuclear Data Tables 72, 239-273 (1999). [10.1006/adnd.1999.0815]
DataDownload (data from fit)

Fitted Data

Fit Function
Details		 \[\sigma_{e}^{ion}\big(E\big) = \frac{10^{-13}}{EI} \Bigg[ A_1\ln \bigg( \frac{E}{I} \bigg) + \sum_{j=2}^{6} A_j \bigg(1- \frac{I}{E} \bigg)^{j-1} \Bigg]\]
Python 
def li_ein_schweinzer(E, A1, A2, A3, A4, A5, A6, I):
    """
    This function calculates electron impact ionization cross sections (in cm2) of 
    Li 2p to 3d.
    param E: requested electron-impact energy in eV
    type E: float, np.ndarray
    param Ai: fit coefficient 
    type Ai: float
    param I: ionization energy in eV
    type I: float
    """
sigma =  (A1*np.log(E/I) + A2*(1-I/E)**1 + A3*(1-I/E)**2 + 
                 A4*(1-I/E)**3 + A5*(1-I/E)**4 + A6*(1-I/E)**5) * 1e-13/(E * I)
return sigma
Fit Precision10.0 %
Fit Coefficients 
A1
 7.535e-02
A2
 1.882e-01
A3
-2.834e-01
A4
 1.538e+00
A5
-1.855e+00
A6
 1.341e+00
I
 3.543e+00
x-range 3.543 –