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OPTICS AND NUCLEAR PHYSICS
Strongest magnetically induced transitions in alkali metal atoms
A. Sargsyan,
A. Tonoyan,
D. Sarkisyan Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak, 0203 Armenia
Abstract:
Atomic transitions in alkali metals that have zero probability in the absence of a magnetic field but have large probabilities in the presence of a magnetic field are called magnetically induced (MI). They are of interest because of their large probabilities, which exceed the probabilities of usual transitions in a wide magnetic field range. Magnetically induced transitions are classified as type-1 (MI1) and type-2 (MI2) and their total number is about
$100$. In this work, MI2 transitions are examined between ground
$F_g$ and excited levels
$F_e$ of the hyperfine structure satisfying the condition
$F_e-F_g = \Delta F = \pm 2$, which are forbidden in zero magnetic field but have large probabilities in the presence of a magnetic field. The probabilities of the MI2 transitions with
$\Delta F = + 2$ and the MI transitions with
$\Delta F = - 2$ are maximal in the case of optical radiation with the
$\sigma^+$ and
$\sigma^-$ polarizations, respectively. This difference is called type-1 magnetically induced circular dichroism (MICD1). It has been shown for the first time that the probability of the strongest MI2 transition in the
$^{85}$Rb atom corresponding to the
$D_2$ line in magnetic fields
$>100$ G in the case of
${\sigma }^{ + }$ radiation is larger than the probability of the strongest MI2 transition in the case of
$\sigma^-$ radiation by a factor of
$2.5$. This difference is called type-2 magnetically induced circular dichroism (MICD2). It has been shown how to determine the strongest MI transition for any alkali metal atom, which is important for its application in magneto-optical processes. Theoretical curves reproduce well experimental results.
Received: 18.03.2021
Revised: 18.03.2021
Accepted: 15.04.2021
DOI:
10.31857/S1234567821100013
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