DataSet D107585

\[\mathrm{H}^{+} + \mathrm{Na} \; 4s \rightarrow \mathrm{Na}^{+}\]

Process HCX: Charge Transfer, HIN: Ionization, COM: Composite Process with Multiple Channels
Channel
  • H+ + Na 4s → Na+ + H
  • H+ + Na 4s → Na+ + H+ + e-
Data type cross section | uploaded on 2022-11-11
Comment Fit based on equation (9). The cross-section was attribited 10% reltive error based on experience featured in Schweinzer et al. ADNDT 72 239 1999.
MethodAOCC: Atomic‐orbital close‐coupling
FrameTarget
Columns
  1. E /eV u-1
  2. sigma /cm2
Threshold2.500 eV
Uncertainty10 %
Ref
  • B47: K. Igenbergs, J. Schweinzer, I. Bray, D. Bridi, F. Aumayr, "Database for inelastic collisions of sodium atoms with electrons, protons, and multiply charged ions ", Atomic Data and Nuclear Data Tables 94, 981-1014 (2008). [10.1016/j.adt.2008.06.001]
DataDownload (data from fit)

Fitted Data

Fit Function
Details		 \[\sigma_{p}^{hel, Na}(E) = A_1 \cdot 10^{-16}\Bigg[ \frac{e^{-\frac{A_2}{E}}\ln\big(1 + A_3E\big)}{E} + A_4\frac{e^{-A_5E}}{\big(A_7E\big)^{A_6}}\Bigg]\]
Python 
def na_hel(E, A1, A2, A3, A4, A5, A6, A7):
    """
    This function calculates proton impact electron loss (ion + CX) cross sections (in cm2) of 
    Na 3s to 5s.
    param E: requested electron-impact energy in keV/u
    type E: float, np.ndarray
    param Ai: fit coefficient 
    type Ai: float
    """
    sigma =  A1*1e-16*((np.exp(-A2/E) * np.log(1 + A3*E))/E + A4*np.exp(-A5*E)/(A7*E)**A6)
    return sigma
Fit Coefficients 
A1
 1.458e+01
A2
 1.067e+00
A3
 5.160e+13
A4
 2.766e+01
A5
 2.490e-01
A6
 1.593e-01
A7
 1.000e+00
x-range 0.2 –