Hyperfine induced intensity redistribution in In

Jon Grumer (1, 2) , Martin Andersson (2, 3) , Tomas Brage (1)

1 Department of Physics
2 Institute of Modern Physics
3 The Key Laboratory of Applied Ion Beam Physics

We present a theoretical investigation of the hyperfine structure of the 5s5d 3 D 2 − 5s4f 3 F o 2, 3 transitions in In ii. Earlier work has failed in determining hyperfine constants for the upper levels of these transitions. We show that this is due to strong off-diagonal hyperfine interaction, which not only changes the position of the individual hyperfine lines, but also introduces large intensity redistributions among the different hyperfine levels. We present hyperfine dependent gf-values and show that off-diagonal hyperfine interaction reduces some of the gf-values by two orders of magnitude, while others are increased by up to more than a factor of 6. We also discuss the influence on the hyperfine structure of an accurate representation of the level-splitting of the 5s4f configuration. We show that the hyperfine interaction in 3 F o 3 and 1 F o 3 is very hard to determine accurately even in a large scale calculation and we derive a semi-empirical method for adjusting our results using an experimentally known, diagonal hyperfine constant for 5s4f 1 F o 3. The resulting theoretical synthetic spectra reproduces the experimental to high accuracy and facilitate identification of all observed lines.

Mots clés: 31.15.A-; 32.10.Fn; 32.70.Cs; 32.70.Jz

Jon Grumer, Martin Andersson, Tomas Brage. Hyperfine induced intensity redistribution in In. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (7), pp.74012. ⟨10.1088/0953-4075/43/7/074012⟩. ⟨hal-00569892⟩