Optical absorption and electron-energy-loss spectra of helium microbubbles in aluminum

J. C. Rife, S. E. Donnelly, A. A. Lucas, J. M. Gilles, J. J. Ritsko

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Aluminum thin films containing helium microbubbles produced by He+-ion implantation have been investigated by ultraviolet absorption and electron-energy-loss spectroscopies in the range 1-30 eV. The shape and position of the 1S01-nP11 helium line series and several Al plasmon bands are discussed in terms of the physical state of helium in the bubbles. Results imply helium densities 3 to 6 times that of liquid He at 2°K and 1 bar pressure.

Original languageEnglish
Pages (from-to)1220-1223
Number of pages4
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 4 May 1981
Externally publishedYes


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