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We have observed several new spectral features in the fluorescence of cesiumatoms implanted in the hcp phase of solid helium following laser excitation tothe 6$^{2}$P states. Based on calculations of the emission spectra usingsemiempirical Cs-He pair potentials the newly discovered lines can be assignedto the decay of specific Cs*He$_{n}$ exciplexes: an apple-shaped Cs$(A\Pi_{3/2})$He$_{2}$ and a dumbbell-shaped Cs$(A\Pi_{1/2}) $He$_{n}$ exciplex witha well defined number $n$ of bound helium atoms. While the former has beenobserved in other enviroments, it was commonly believed that exciplexes with$n>2$ might not exist. The calculations suggest Cs$(A\Pi_{1/2}) $He$_{6}$ to bethe most probable candidate for that exciplex, in which the helium atoms arearranged on a ring around the waist of the dumbbell shaped electronic densitydistribution of the cesium atom.Comment: 4 pages, 4 figure

physical review letters

Discovery of Dumbbell-Shaped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">s</mml:mi></mml:mrow><mml:mo>*</mml:mo></mml:msup><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mi>n</mml:mi></mml:msub></mml:math>Exciplexes in Solid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:…

Discovery of Dumbbell-ShapedCs*HenExciplexes in Solid