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Structure and photoluminescence of helium-intercalated fullerite C₆₀

Intercalation of C₆₀ single crystals with helium was studied by powder x-ray diffractometry. It was established that the intercalation is a two-stage process, octahedral cavities are filled first and then tetrahedral ones, the chemical pressure being negative during both stages. For the first time l...

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Bibliographic Details
Main Authors: Legchenkova, I.V., Prokhvatilov, A.I., Stetsenko, Yu.E., Strzhemechny, M.A., Yagotintsev, K.A., Avdeenko, A.A., Eremenko, V.V., Zinoviev, P.V., Zoryansky, V.N., Silaeva, N.B., Ruoff, R.S.
Format: Article
Language:English
Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2002
Series:Физика низких температур
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Online Access:http://dspace.nbuv.gov.ua/handle/123456789/128766
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Summary:Intercalation of C₆₀ single crystals with helium was studied by powder x-ray diffractometry. It was established that the intercalation is a two-stage process, octahedral cavities are filled first and then tetrahedral ones, the chemical pressure being negative during both stages. For the first time low-temperature (5 K) photoluminescence spectra of helium-intercalated fullerite C₆₀ were studied. The presence of helium in lattice voids was shown to reduce that part of the luminescent intensity which is due to the emission of covalently bound pairs of C₆₀ molecules, the socalled "deep traps" with the 0-0 transition energy close to 1.69 eV. The mechanism of the effect of the intercalation with helium on the pair formation in fullerite C₆₀ is discussed.