Spectroscopy Letters

Multiple Anticrossings of Magnetic Hyperfine Atomic Sublevels

Eusebio Bernabéu, Alarcón Cavero

Published Jan 1, 1979• 2 citations

Abstract

An analysis of the anticrossing of several magnetic hyperfine sublevels of the same fine structure level is made. An expression for the resonance fluorescence signal is derived. Physical requirements for observation are discussed and lineshapes computed.

DOI: 10.1080/00387017908069184

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Spectroscopy Letters

Multiple Anticrossings of Magnetic Hyperfine Atomic Sublevels

Eusebio Bernabéu, Alarcón Cavero

Published Jan 1, 1979• 2 citations

Publisher

Abstract

DOI: 10.1080/00387017908069184

Related papers

"Anticrossing" Signals in Resonance Fluorescence

Harold Wieder, T. G. Eck

The level-crossing technique of atomic spectroscopy utilizes the spatial interference in the scattering of resonance radiation which can occur when two Zeeman levels of an atom are brought into coincidence ("crossed") by the application of an external magnetic field. "Anticrossing" refers to the case where the two levels involved are coupled by a small static interaction. In this paper the general expression for an anticrossing signal is given and its predictions compared with signals observed in the $2 ^{2}P$ term of Li. It is shown that anticrossings produce signals in many experimental situations for which there would be no signal from a normal level crossing.The level-crossing technique of atomic spectroscopy utilizes the spatial interference in the scattering of resonance radiation which can occur when two Zeeman levels of an atom are brought into coincidence ("crossed") by the application of an external magnetic field. "Anticrossing" refers to the case where the two levels involved are coupled by a small static interaction. In this paper the general expression for an anticrossing signal is given and its predictions compared with signals observed in the $2 ^{2}P$ term of Li. It is shown that anticrossings produce signals in many experimental situations for which there would be no signal from a normal level crossing.

Physical ReviewJan 5, 1967125 citations

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Physical ReviewOct 5, 19679 citations

2 ^{2}P

term of Li. It is shown that anticrossings produce signals in many experimental situations for which there would be no signal from a normal level crossing.

{3}^{2}D

term of Li.

2P

levels and shows an extremum at the point where two levels cross. Neglecting hyperfine structure, there are two level crossings of interest: one at 3484 G ($2{P}_{\frac{3}{2,\ensuremath{-}\frac{3}{2}}}\ensuremath{-}2{P}_{\frac{1}{2},\frac{1}{2}}$), and the other 5223G ($2{P}_{\frac{3}{2,\ensuremath{-}\frac{3}{2}}}\ensuremath{-}2{P}_{\frac{1}{2},\ensuremath{-}\frac{1}{2}}$), respectively. The coher$\stackrel{\mathrm{\ifmmode \breve{}\else \u{}\fi{}}}{\mathrm{e}}$nt and incoherent resonance scattering is determined near these crossing points by using a Hamiltonian that includes hyperfine structure and higher-order radiative effects. In the low-field region (3484 G), the hyperfine crossings that contribute to the coherent signal are at 3476.06 and 3491.93 G, respectively. The radiative width of the levels is considerably larger than the hyperfine splittings, and the total scattering intensity has a single peak at 3483.97 G. In the high-field region (5223 G), two hyperfine levels with ${m}_{F}=\ensuremath{-}1$ repel each other (anticross) with a minimum energy separation of 15.3 Mc/sec at 5200.1 G. Resonances occur at 5220.6 and 5223.9 G, and the maximum of the total signal is at 5222.6 G.