Discovery of dumbbell-shaped CsHe(n) exciplexes in solid ⁴He
- Nettels, Daniel Department of Physics, University of Fribourg, Switzerland
- Hofer, Adrian Department of Physics, University of Fribourg, Switzerland
- Moroshkin, Peter Department of Physics, University of Fribourg, Switzerland
- Müller-Siebert, Reinhard Department of Physics, University of Fribourg, Switzerland
- Ulzega, Simone Department of Physics, University of Fribourg, Switzerland
- Weis, Antoine Department of Physics, University of Fribourg, Switzerland
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14.02.2005
Published in:
- Physical Review Letters. - 2005, vol. 94, p. 063001
English
We have observed several new spectral features in the fluorescence of cesium atoms implanted in the hcp phase of solid helium following laser excitation to the 6²P states. Based on calculations of the emission spectra using semi empirical Cs-He pair potentials the newly discovered lines can be assigned to the decay of specific Cs*He(n) exciplexes: an apple-shaped Cs(AП(3/2))He₂ and a dumbbell-shaped Cs(AП(1/2))He(n) exciplex with a well-defined number n of bound helium atoms. While the former has been observed in other environments, it was commonly believed that exciplexes with n>2might not exist. The calculations suggest Cs(AП(1/2))He₇ to be the most probable candidate for that exciplex, in which the helium atoms are arranged on a ring around the waist of the dumbbell-shaped electronic density distribution of the cesium atom.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 4313
- DOI 10.1103/PhysRevLett.94.063001
- Persistent URL
- https://folia.unifr.ch/unifr/documents/299658
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