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Article Dans Une Revue Journal of Physics: Conference Series Année : 2012

Absorption spectra of NaHe from white dwarfs to helium clusters

Nicole F. Allard
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Akira Nakayama
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John F. Kielkopf
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Frank Stienkemeier
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Résumé

The absorption spectrum of Na produced in dense He shows line features, broadening and shift due to extrema in the 3s-3p potential differences of the transitions which contribute to the two fine-structure components. We present here a comprehensive study of NaHe collisional profiles at high density, and temperatures from 5000 K, the temperature prevailing in the atmosphere of ultra-cool white dwarfs, down to 1 K. At extremely low temperatures, experimental measurements and theoretical calculations of helium doped with alkali metals have been the subject of active study. The alkali-metal atoms are weakly bound to helium nanodroplets, and it appears that the dopants are trapped in a shallow dimple on the cluster's surface, rather being solvated inside the cluster.

Dates et versions

hal-00862210 , version 1 (16-09-2013)

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Citer

Nicole F. Allard, Akira Nakayama, Fernand Spiegelman, John F. Kielkopf, Frank Stienkemeier. Absorption spectra of NaHe from white dwarfs to helium clusters. Journal of Physics: Conference Series, 2012, 397 (1), pp.012067/1-012067/6. ⟨10.1088/1742-6596/397/1/012067⟩. ⟨hal-00862210⟩
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