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Canadian Journal of Physics

The density dependence of the Hanle effect in the resonance line of atomic barium

F. M. Kelly, M. S. Mathur

Published Jan 1, 1977• 40 citations
Publisher

Abstract

The change in the Hanle effect of the singlet resonance line of neutral barium has been studied over a wide range of density. The low density region has been used to confirm a lifetime of 8.37 ± 0.08 ns for the 6s6p1P1 level. We have determined the cross sections for the relaxation of the multipole moment of order 2 for collisions of the excited level with the ground level and with the metastable 6s5d1D2 level, and comparisons are made with the measured value of [Formula: see text] for the ground level with theoretical predictions.

DOI
10.1139/p77-011

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Hanle Effect in Transitions from the 5s6p and 5s7p1P1 Levels of Strontium and Coherence Narrowing

F. M. Kelly, T. K. Koh, M. S. Mathur

The lifetimes of the 5s6p and 5s7p excited singlet P levels of strontium have been measured using the Hanle effect of the 2932 and 2574 Å transitions to the 5s21S0 level. These lifetimes are compared with those reported previously using the same technique in the 7169 and 5331 Å transitions to the metastable 5s4d1D2 level. The dependence of lifetime on the density of the scattering atoms in the coherence narrowing region has also been determined.

Canadian Journal of Physics•May 1, 1975•3 citations
The change in the Hanle effect of the singlet resonance line of neutral barium has been studied over a wide range of density. The low density region has been used to confirm a lifetime of 8.37 ± 0.08 ns for the 6s6p1P1 level. We have determined the cross sections for the relaxation of the multipole moment of order 2 for collisions of the excited level with the ground level and with the metastable 6s5d1D2 level, and comparisons are made with the measured value of [Formula: see text] for the ground level with theoretical predictions.
The Hanle effect and its variation with density has been used to determine the depolarization cross section for collisions between the 2P32^{2}P_{\frac{3}{2}}2P23​​ barium ions and neutral atoms. An extrapolation of the data to zero density gives a value of the average lifetime $\ensuremath{\tau}=6.22$ ns for the 6p2P326p^{2}P_{\frac{3}{2}}6p2P23​​ level. A further experiment gives $\ensuremath{\tau}=7.55$ ns for the 6p2P126p^{2}P_{\frac{1}{2}}6p2P21​​ level.