Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Ionization of W and W+ by Electron Impact



D H. Kwon, Y J. Rhee, Yong Sik Kim


Theoretical cross sections for electron-impact ionization of the neutral W atom and W$^+$ ion are reported. The direct ionization cross sections were calculated by using the binary-encounter Bethe (BEB) model and the indirect ionization cross sections resulting from numerous excitation-autoionization (EA) were calculated by using scaled Born cross sections. Contributions to indirectionization from spin-forbidden and $\Δ n = 1$ excitations, where $n$ is the principal quantum number, are noticeable unlike in light atoms. The single ionization cross section of W$^+$ is increased by about 10$\%$ due to the indirect EA of $5p$ electrons in the range of the incident electron energies between $40$ and $60$ eV. In the case of neutral W the EA cross sections are very small for the $^7$S$_3$ level which is the first metastable term of W and because the excitations to the high spin states are mostly in
International Journal of Mass Spectrometry


autoionization, ionization cross section, W, W+


Kwon, D. , Rhee, Y. and Kim, Y. (2021), Ionization of W and W+ by Electron Impact, International Journal of Mass Spectrometry (Accessed May 26, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created October 12, 2021