Scattering polarization of hydrogen lines from electric-induced atomic alignment

Details Scattering polarization of hydrogen lines from electric-induced atomic alignment Scattering polarization of hydrogen lines from electric-induced atomic alignment

2007-05-29

arxiv.org/abs/0705.4133v2

J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 085702

Physics

Quantum Physics

10 pages, 4 figures. Accepted by J.Phys.B: At.Mol.Opt.Phys

Scientific paper

10.1088/0953-4075/41/8/085702

We consider a gas of hydrogen atoms illuminated by a broadband, unpolarized radiation with zero anisotropy. In the absence of external fields, the atomic J-levels are thus isotropically populated. While this condition persists in the presence of a magnetic field, we show instead that electric fields can induce the alignment of those levels. We also show that this electric alignment cannot occur in a two-term model of hydrogen (e.g., if only the Ly-alpha transition is excited), or if the level populations are distributed according to Boltzmann's law.

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