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Optics and Spectroscopy

Chemi-ionization and spin exchange upon collisions of metastable helium atoms with potassium atoms in the ground state

Victor A. Kartoshkin, G. V. Klement’ev

Published Apr 1, 2007• 1 citation
Publisher

Abstract

The spin exchange and chemi-ionization cross sections have been calculated for the metastable helium atom-potassium atom system in the ground state. The data on the spin exchange cross section in the system He(23 S 1)-K(42 S 1/2) have been obtained for the first time. The cross sections were calculated for the collision energies ranging from 2 × 10−4 to 60 × 10−4 au The chemi-ionization cross sections obtained have been compared with the data in the literature.

DOI
10.1134/s0030400x07040066

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The spin exchange and chemi-ionization cross sections have been calculated for the metastable helium atom-potassium atom system in the ground state. The data on the spin exchange cross section in the system He(23 S 1)-K(42 S 1/2) have been obtained for the first time. The cross sections were calculated for the collision energies ranging from 2 × 10−4 to 60 × 10−4 au The chemi-ionization cross sections obtained have been compared with the data in the literature.
In the collision of spin-polarized atoms, the transmission of electron polarization between colliding particles is possible. A similar situation occurs in a collision, for example, between alkali atoms in the ground state. If one of the colliding particles is in an excited state and its energy is sufficient for ionization of the collision partner, then along with the elastic process (spin exchange), an inelastic process (ionization) is also possible, as a result of these processes polarization can also be transferred to the partner. Simultaneously occurring elastic and inelastic processes at the collision between two helium atoms are possible if these atoms are in the metastable (23S1) state. The paper discusses the interaction between spin-polarized metastable atoms of helium-3 and helium-4 isotopes under conditions of optical pumping of atoms. Complex interaction potentials of the atoms under consideration were constructed and on their basis, the spin exchange and chemo-ionization cross-sections were calculated. Using these cross-sections, expressions for the transfer of orientation and alignment from one atom to another were obtained.
The spectroscopy of metastable states is used to make the first experimental measurement of the total differential elastic-scattering cross sections of metastable helium atoms in 2 3 S and 2 1 S states by sodium atoms in the ground state at interaction energy 68 meV in the center-of-mass system. To analyze the experimental data, the partial scattering phases are calculated using the method of phase functions in the optical potential approximation. The analysis makes it possible to give a more detailed interpretation of the structure of the differential cross section. The computed integral cross sections, specifically, Penning ionization, diffusion, viscosity, and spin exchange are discussed.