Abstract
Cross sections have been calculated for the Penning ionization of ground-state potassium atoms in collisions with metastable He(2 /sup 1,3/S) atoms for the range of center-of-mass-system energies 0.01 eVless than or equal toEless than or equal to1.0 eV. The cross sections were calculated using ab initio ptical potentials. The real part of the optical potential was obtained by adjusting the potential curve resulting from a configuration-interaction (CI) calculation performed on the HeK molecule so as to include the correct van der Waals asymptotic form. The imaginary part was obtained by performing a Stieltjes moment analysis of a discrete (L/sup 2/) representation of the HeK/sup +/+e/sup -/ continuum generated in a CI procedure. The calculated cross section for He(2 /sup 3/S) scattered from K at E = 0.032 eV is in good agreement with stationary afterglow measurements at room temperature. A nearly degenerate core-excited state of potassium (which has a curve crossing with the He(2 /sup 3/S)K molecular state) is then explicitly included in a Landau-Zener formulation which further increases the calculated cross section, but it still agrees well with the room-temperature measurements. Elastic differential cross sections for He(2 /sup 1/S) on K are also reported.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
