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Physica

Determination of signs of atomic splitting constants using level-crossing techniques

Gebhard von Oppen, H.W. Popp

Published Jan 1, 1973• 5 citations
Publisher
DOI
10.1016/0031-8914(73)90181-x

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Untersuchung der Hyperfeinstruktur des 5s25d2D3/2-und 5s26d2D3/2-Terms im In I-Spektrum durch Resonanzstreuung von Licht im äußeren Magnetfeld / Hyper fine Structure Investigation of the 5s25d2D3/2- and 5s26d2Ds3/2-States of the ln I-Spectrum by Resonance Scattering of Light in an External Magnetic Field

Michael Brieger, Hans Bucka, A. Reichelt +1 more

Using an Indium atomic beam as absorber the resonance fluorescence of the transitions 5d2D3/2 - 5p2P1/2 (λ = 3039 Å) and 6d2D3/2-5p2P 1/2 (λ=2560 Å) was measured as a function of an external magnetic field. In both states two signals were observed at magnetic fields, where three level crossings occur. The observed line shape is discussed for the case of overlapping level crossing components with regard to radiation width and hyperfine structure splitting. The experimental results can be described by the following values for the lifetime τ and the hyperfine structure constants A and B : 5d2D3/2: | A|=(64.5±1.0) Mc/sec·gJ/0.8; B/A = - 0.59±0.17; τ = ( 7.0± 0.4) · 10-9 sec · 0.8/gJ ; 6d2D3/2: | A | =(72.1 ±0.3) Mc/sec·gJ/0.8 ; B/A = - 0.47 ±0.05; τ = (25.5±1 ) ·10-9 sec-0.8/gJ . The values and the sign of the hyperfine structure constants indicate interconfiguration mixing.

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The Determination of Atomic Wave Functions

Louis C. Green

•Jan 1, 1955•0 citations
Stark effect investigations in the 6, 7 and 82D3/2,5/2levels of85Rb and the 8, 9 and 102D3/2,5/2levels of133Cs were performed with the level crossing technique. The levels were populated in a two-step excitation process, involving a CW tunable dye laser. The tensor polarizability of all states was measured and a good agreement with theoretical values, obtained with the Coulomb approximation, is found. Furthermore, the signs of the dipole interaction constants, determined to absolute value in earlier experiments, could be inferred. The sign was found to be positive for the2D3/2states and negative for the2D5/2states, indicating strong polarization effects in the magnetic hyperfine interaction.
The fine-structure splitting of the 4F4F4F state of atomic sodium is determined using the technique of two-photon spectroscopy with a resonant intermediate state. The sensitivity of this Doppler-free technique allows observation of the electric-dipole-forbidden $3S\ensuremath{\rightarrow}4F$ two-photon transition. The 4F4F4F fine-structure splitting is found to be 229\ifmmode\pm\else\textpm\fi{}4 MHz. Its sign and magnitude are hydrogenic, in complete contrast to the DDD levels of Na.
Using an Indium atomic beam as absorber the resonance fluorescence of the transitions 5d2D3/2 - 5p2P1/2 (λ = 3039 Å) and 6d2D3/2-5p2P 1/2 (λ=2560 Å) was measured as a function of an external magnetic field. In both states two signals were observed at magnetic fields, where three level crossings occur. The observed line shape is discussed for the case of overlapping level crossing components with regard to radiation width and hyperfine structure splitting. The experimental results can be described by the following values for the lifetime τ and the hyperfine structure constants A and B : 5d2D3/2: | A|=(64.5±1.0) Mc/sec·gJ/0.8; B/A = - 0.59±0.17; τ = ( 7.0± 0.4) · 10-9 sec · 0.8/gJ ; 6d2D3/2: | A | =(72.1 ±0.3) Mc/sec·gJ/0.8 ; B/A = - 0.47 ±0.05; τ = (25.5±1 ) ·10-9 sec-0.8/gJ . The values and the sign of the hyperfine structure constants indicate interconfiguration mixing.