DataSet D107424

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

Process EIN: Ionization
Data type cross section | uploaded on 2022-11-11
Comment Equation eq(1) from Wutte et al. The data taken from Lennon_JPhysChemRefData_17_1285_1988 where experimental fit occured.
Methodexperimental
Columns
  1. E /eV
  2. sigma /cm2
Threshold5.390 eV
Uncertainty10 %
Ref
  • B18: D. Wutte, R.K. Janev, F. Aumayr, M. Schneider, J. Schweinzer, J.J. Smith and H.P. Winter, "CROSS SECTIONS FOR COLLISION PROCESSES OF Li ATOMS INTERACTING WITH ELECTRONS, PROTONS, MULTIPLY CHARGED IONS, AND HYDROGEN MOLECULES", Atomic Data and Nuclear Data Tables 65, 155-180 (1997). [10.1006/adnd.1997.0736]
  • B28: M. A. Lennon, K. L. Bell, H. B. Gilbody, J. G. Hughes, A. E. Kingston, M. J. Murray, F. J. Smith, "Recommended Data on the Electron Impact Ionization of Atoms and Ions: Fluorine to Nickel ", Journal of Physical and Chemical Reference Data 17, 1285-1363 (1988). [10.1063/1.555809]
DataDownload (data from fit)

Fitted Data

Fit Function
Details		 \[\sigma_{e}^{ion,\;Li(2s)}\big(E\big) = \frac{10^{-13}}{IE}\Bigg[A \ln\bigg( \frac{E}{I} \bigg) + \sum_{j=1}^{3}A_j\bigg(1-\frac{I}{E}\bigg)^j \Bigg]\]
Python 
def li_ein_2s_lennon(E, A, A1, A2, A3, I):
    """
    This function calculates the electron impact ionization cross sections (in cm2) of 
    Li 2s.
    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 =  (A*np.log(E/I) + A1*(1-(I/E))**1 + A2*(1-(I/E))**2 + A3*(1-(I/E))**3)*1e-13/(E*I)
return sigma
Fit Precision10.0 %
Fit Coefficients 
A
 8.500e-02
A1
-4.000e-03
A2
 7.570e-01
A3
-1.780e-01
I
 5.390e+00
x-range 5.39 –