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- W2055249199 abstract "We excited helium atoms using 10--20-keV H{sub 2}{sup +} (D{sub 2}{sup +}) ion impact and investigated the intensity of the {lambda}(4{sup 3}{ital D}-2{sup 3}{ital P})=447 nm line as a function of an electric field {minus}2 kV/cm{approx lt}{ital F}{le}+2 kV/cm applied antiparallel and parallel to the ion beam. The recorded signals were strongly asymmetric with respect to the sign of the electric field. This asymmetry is explained by assuming a coherent excitation of He levels with different angular momenta (4{ital d},4{ital f} and 5{ital f},5{ital g}). These measurements demonstrate that angular momentum coherences of impact-excited states can also be observed in nonhydrogenic systems." @default.
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- W2055249199 date "1990-04-16" @default.
- W2055249199 modified "2023-10-01" @default.
- W2055249199 title "Electric dipole moments of impact-excited He atoms" @default.
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- W2055249199 doi "https://doi.org/10.1103/physrevlett.64.1879" @default.
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