Intercalation of <$E roman C sub 60> single crystals with helium was studied by powder x-ray diffractometry. It was established that the intercalation is a two-stage process, octahedral cavities are filled first and then tetrahedral ones, the chemical pressure being negative during both stages. For the first time low-temperature (5 K) photoluminescence spectra of helium-intercalated fullerite <$E roman C sub 60> 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 <$E roman C sub 60> molecules, the socalled "deep traps" with the 0 - 0 transition energy close to 1,69 eV. The mechanism of the effect of the intercalation with helium on the pair formation in fullerite <$E roman C sub 60> is discussed.

• Стржемечний Михайло Олексійович (1940–) (фізико-математичні науки)
• Єременко Віктор Валентинович (1932–2017) (фізико-математичні науки)
• Зінов'єв Петро Васильович (фізико-математичні науки)

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