Abstract:
The article considers the interaction of alkali atoms Na and Cs in a Na–Cs mixture during optical orientation. Such systems are used as working media when creating devices that operate on the principles of optical orientation of atoms and are used for magnetic measurements. In particular, when developing quantum magnetometers, gyroscopes, and magnetoencephalographs. Optically oriented atoms of alkali metals in the working chamber of such devices collide with each other, and the collisions of atoms are accompanied by the known process of spin exchange (i.e., there is an exchange of electron polarization between the colliding atoms). The spin exchange process significantly affects the width of the magnetic resonance line, as well as the frequency shift. In this work, the dependences of the magnetic resonance frequency shifts on temperature in the range $T$ = 300–400 K are calculated, caused by collisions of optically oriented atoms for various hyperfine levels of these atoms (the total moment $F$ = 4.3 for Cs atoms and $F$ = 2.1 for Na atoms). A significant difference in the dependence of shifts on temperature for optical orientation of $^{133}$Cs or $^{23}$Na atoms for different hyperfine levels has been established.
Keywords:frequency shift, optical orientation, magnetic resonance.
Fulltext:
PDF file (232 kB)