Elastic Scattering of Metastable He(2^1,3S) Atoms
by Na(3²S) Atoms at 68 meV

E. Yu. Remeta, V. I. Kelemen, A. N. Zavilopulo, and A. V. Snegurski*

Institute of Electron Physics, National Academy of Sciences of Ukraine, 8800 Uzhgorod, Ukraine
*e-mail: sneg@iep.uzhgorod.ua

Received June 14, 1999

Abstract—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 2³S and 2¹S states by sodium
atoms in the ground state at interaction energy 68 meV in the center-of-mass system. To analyze the experimen-
tal 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 dif-
ferential cross section. The computed integral cross sections, specifically, Penning ionization, diffusion, viscos-
ity, and spin exchange are discussed. © 2000 MAIK “Nauka/Interperiodica”.

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