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Technical Physics

Measurement of the spin-exchange and chemical ionization rate constants in collisions of polarized metastable 23 S 1 helium atoms with 32 S 1/2 sodium atoms

Sergei P. Dmitriev, N. A. Dovator, Victor A. Kartoshkin

Published Oct 1, 2009• 0 citations
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Abstract

Experimental data on the spin-exchange rate constants for the He(23 S 1)-Na(32 S 1/2) system are reported for the first time. Measurements show that the spin-exchange rate constant is C se = (23 ± 11) × 10−10 cm3 s−1 and the chemical ionization rate constant is C si = (29 ± 14) × 10−10 cm3 s−1 at a temperature of 420 K. The results are compared with the data calculated from the rate constants.

DOI
10.1134/s1063784209100235

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Experimental data on the spin-exchange rate constants for the He(23 S 1)-Na(32 S 1/2) system are reported for the first time. Measurements show that the spin-exchange rate constant is C se = (23 ± 11) × 10−10 cm3 s−1 and the chemical ionization rate constant is C si = (29 ± 14) × 10−10 cm3 s−1 at a temperature of 420 K. The results are compared with the data calculated from the rate constants.
The rate constant for spin exchange in a system consisting of a metastable helium atom and an alkali-metal atom is determined. An experiment on optical orientation of atoms established that the rate constant for spin exchange in a collision of a metastable 2 3 S 1 helium atom with a cesium atom in the 6 2 S 1/2 ground state equals (2.8±0.8)×10 −9 cm 3 s −1 . The rate constant for chemoionization of cesium atoms by metastable helium atoms was determined at the same time to be (1.0±0.3)×10 9 cm 3 s −1 .
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.