Complex cross sections of the spin exchange are calculated for the first time for interacting Na and K atoms based on the data on the singlet (X 1Σ+) and triplet (a 3Σ+) potentials that describe the interaction of these alkali-metal atoms in the ground state. The obtained cross sections allow one to theoretically consider the polarization transfer processes and calculate the relaxation times and the magnetic resonance frequency shifts caused by Na-K spin-exchange collisions.

Optics and SpectroscopyNov 1, 201015 citations

Optics and Spectroscopy

Spin-Exchange Collisions in the K–Li System

Victor A. Kartoshkin

Published Oct 1, 2019• 4 citations

Publisher

Abstract

X{}^{1}{{\Sigma }^{ + }}

) and triplet (

a{}^{3}{{\Sigma }^{ + }}

) interaction potentials of 39K7Li dimer. A passage from the energy dependences to the temperature ones of the real and imaginary parts of the complex spin-exchange cross section yields information about both the broadening of the magnetic resonance line of the atoms under study and the magnetic-resonance frequency shift in their collision.

DOI: 10.1134/s0030400x19100138

Related papers

Спин-обменные столкновения в системе K-Li

Victor A. Kartoshkin

AbstractSpin-exchange cross sections and the magnetic-resonance frequency shift in collision of lithium and potassium atoms in the ground state have been calculated for the first time. The cross sections are calculated based on the data on the singlet ( $X{}^{1}{{\Sigma }^{ + }}$ ) and triplet ( $a{}^{3}{{\Sigma }^{ + }}$ ) interaction potentials of ^39K^7Li dimer. A passage from the energy dependences to the temperature ones of the real and imaginary parts of the complex spin-exchange cross section yields information about both the broadening of the magnetic resonance line of the atoms under study and the magnetic-resonance frequency shift in their collision.AbstractSpin-exchange cross sections and the magnetic-resonance frequency shift in collision of lithium and potassium atoms in the ground state have been calculated for the first time. The cross sections are calculated based on the data on the singlet ( $$X{}^{1}{{\Sigma }^{ + }}$$ ) and triplet ( $$a{}^{3}{{\Sigma }^{ + }}$$ ) interaction potentials of ^39K^7Li dimer. A passage from the energy dependences to the temperature ones of the real and imaginary parts of the complex spin-exchange cross section yields information about both the broadening of the magnetic resonance line of the atoms under study and the magnetic-resonance frequency shift in their collision.

Журнал технической физикиJan 1, 20192 citations

Collisions with Participation of Polarized Cesium and Lithium Alkali Atoms

Victor A. Kartoshkin

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 ( $X{}^{1}{{\Sigma }^{ + }}$ ) and triplet ( $a{}^{3}{{\Sigma }^{ + }}$ ) 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.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 ($$X{}^{1}{{\Sigma }^{ + }}$$) and triplet ($$a{}^{3}{{\Sigma }^{ + }}$$) 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.

Optics and SpectroscopyApr 1, 20200 citations

Spin exchange during collisions of potassium atoms: Complex cross sections

Victor A. Kartoshkin

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 $q = \bar q + i\overline{\overline q}$ 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.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 $$q = \bar q + i\overline{\overline q}$$ 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.

Optics and SpectroscopyDec 1, 20119 citations

Столкновения с участием поляризованных щелочных атомов цезия и лития

Victor A. Kartoshkin

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.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.

Журнал технической физикиJan 1, 20200 citations

Collisions of Lithium Atoms in Ground State. Complex Spin-Exchange Cross Sections

Victor A. Kartoshkin

Abstract Interaction of two polarized lithium atoms (7Li) is analyzed. When such atoms collide with each other, spin exchange, i.e., an exchange of electron polarization between colliding atoms, takes place in addition to elastic scattering. Simultaneously with polarization transfer, spin exchange leads to frequency shift of the magnetic resonance of colliding atoms. Based on the data on potentials describing interaction between two lithium atoms, energy dependences of spin-exchange cross section and cross section of frequency shift of magnetic resonance are calculated for the first time.Abstract Interaction of two polarized lithium atoms (7Li) is analyzed. When such atoms collide with each other, spin exchange, i.e., an exchange of electron polarization between colliding atoms, takes place in addition to elastic scattering. Simultaneously with polarization transfer, spin exchange leads to frequency shift of the magnetic resonance of colliding atoms. Based on the data on potentials describing interaction between two lithium atoms, energy dependences of spin-exchange cross section and cross section of frequency shift of magnetic resonance are calculated for the first time.

Optics and SpectroscopyJun 1, 20213 citations

Complex cross sections of spin exchange in collisions of sodium and potassium atoms in the ground state

Victor A. Kartoshkin

Optics and SpectroscopyNov 1, 201015 citations

X{}^{1}{{\Sigma }^{ + }}

) and triplet (

a{}^{3}{{\Sigma }^{ + }}

X{}^{1}{{\Sigma }^{ + }}

) and triplet (

a{}^{3}{{\Sigma }^{ + }}

) interaction potentials of ^39K^7Li dimer. A passage from the energy dependences to the temperature ones of the real and imaginary parts of the complex spin-exchange cross section yields information about both the broadening of the magnetic resonance line of the atoms under study and the magnetic-resonance frequency shift in their collision.

X{}^{1}{{\Sigma }^{ + }}

) and triplet (

a{}^{3}{{\Sigma }^{ + }}

) 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.

q = \bar q + i\overline{\overline q}

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.