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Technical Physics

Spin exchange upon collision of two cesium atoms in the ground state

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

Published Jun 1, 2015• 14 citations
Publisher

Abstract

The spin exchange cross sections and the magnetic resonance frequency shift upon collision of two cesium atoms in the ground state are calculated. The calculations are carried out on the basis of the interaction potentials for the singlet (X −1Σ+) and triplet (a 3Σ+) states of the Cs2 dimer, reported in the literature in recent years. The results are compared with earlier data.

DOI
10.1134/s1063784215060079

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The spin exchange cross sections and the magnetic resonance frequency shift upon collision of two cesium atoms in the ground state are calculated. The calculations are carried out on the basis of the interaction potentials for the singlet (X −1Σ+) and triplet (a 3Σ+) states of the Cs2 dimer, reported in the literature in recent years. The results are compared with earlier data.
Abstract The spin-exchange cross sections and the magnetic resonance frequency shift in collision of lithium and cesium atoms in the ground state are calculated. The calculations are performed based on the data on the singlet (X1Σ+X{}^{1}{{\Sigma }^{ + }}X1Σ+) and triplet (a3Σ+a{}^{3}{{\Sigma }^{ + }}a3Σ+) interaction potentials of 7Li 133Cs dimer. The passage from the energy dependences of the real and imaginary parts of the complex spin-exchange cross section to the temperature dependences makes it possible to obtain information on both the broadening and the frequency shift of the magnetic resonance line in collisions of the atoms under study.
The cross section and frequency shift of the magnetic resonance line for the spin exchange are calculated for a collision of lithium and cesium atoms in the ground state. The calculation was carried out on the basis of data on the singlet (X1Sigma+) and triplet (a3Sigma+) interaction potentials of the 7Li133Cs dimer. The transfer from the energy to the temperature dependence of the real and imaginary parts of the complex cross sections for a spin exchange allows us to obtain information both the broadening of the magnetic resonance line of the atoms under study and the frequency shift of the magnetic resonance upon their collision.
Singlet (X 1Σ+) and triplet (a 3Σ+) potentials of interaction of two potassium atoms residing in the ground state (4s 2 S 1/2) are presented. Based on the given interaction potentials, the complex cross sections of spin exchange q=qˉ+iq‾‾q = \bar q + i\overline{\overline q}q=qˉ​+iq​​ for the system under investigation are calculated. Obtained dependences of the real and imaginary parts of the spin-exchange cross section on temperature allow one to obtain information both on the broadening of a magnetic resonance line of K atoms and on the frequency shift of the magnetic resonance during collision.
Complex spin-exchange cross sections are calculated on the basis of the data on the singlet (X 1Σ+) and triplet (a 3Σ+) potentials describing the interaction of isotopes of Rb alkali-metal atoms in the ground state. The cross sections calculated in this study are compared with the cross-section data obtained earlier with the model interaction potentials. The cross-section values allow one to calculate the processes of polarization transfer and the relaxation times, as well as the magnetic resonance frequency shifts caused by the Rb‒Rb spin-exchange collisions.