Measurement of linear Stark interference in the 6¹S₀→6³P₁ transition in ¹⁹⁹Hg. UV light (purple arrows) impinges on four cells filled with mercury vapor (blue) in a uniform magnetic field. The two middle cells are subject to antiparallel electric fields between a ground plane (yellow) and high-voltage electrodes on either side (gray).

From the article:

Measurement of Linear Stark Interference in ${}^{199}\mathrm{Hg}$
T. H. Loftus, M. D. Swallows, W. C. Griffith, M. V. Romalis, B. R. Heckel, and E. N. Fortson
Phys. Rev. Lett. 106, 253002 (2011)

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