Abstract
The “mixing” of magnetic sublevels of the ground and excited levels of an atomic transition with magnetic sublevels of a nearby transition (in the hyperfine structure of atoms of alkali metals) is responsible for a strong modification of its probability. A dramatic manifestation of this mixing effect is a huge increase in the probability of the atomic transition in magnetic fields that is forbidden by selection rules in zero magnetic field B = 0; the latter is called a magnetically induced (MI) transition. Two MI transitions with different dependences on B have been studied. Another dramatic manifestation of the mixing effect is that there are atomic transitions whose frequency is practically fixed in a wide range of magnetic fields, i.e., the slope S [MHz/G] of the frequency shifts as a function of B is practically zero, with the transition probability being significant. We call these transitions “unmoved” transitions (UTs). We have studied the UTs of 87Rb atoms, the D2 line, |1, +1〉 → |1', +1'〉 and Cs atoms, the D2 line, |3, –3〉 → |5', –4'〉, where the quantum numbers F and mF of the excited and ground levels are marked with and without primes, respectively. We show that in the range B = 180–705 G for 87Rb, the D2 line, |S| ≤ 0.03 MHz/G; for comparison, S ≈ 3.6 MHz/G for 87Rb in the same B range for the MI transition |1, +1〉 → |3', +2'〉 is greater by a factor of 120. A second laser was used to control the UT amplitude. Our theoretical model describes well the experiment.
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ACKNOWLEDGMENTS
We thank A. Tonoyan for the useful discussion.
Funding
This study was supported by the Committee on Science of the Ministry of Education, Science, Culture, and Sports of the Republic of Armenia (project nos. 18T-1CO18 and 19YR-1C017).
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Translated by V. Astakhov
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Sarkisyan, D., Hakhumyan, G. & Sargsyan, A. “Unmoved” Atomic Transitions of Alkali Metals in External Magnetic Fields. J. Exp. Theor. Phys. 131, 671–678 (2020). https://doi.org/10.1134/S1063776120100143
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DOI: https://doi.org/10.1134/S1063776120100143