No abstract

C 60 H 2 has been synthesized by ultrasonically irradiating solutions of C 60 in decahydronaphthalene. This synthesis can be understood as a secondary reaction arising from the production of atomic hydrogen during sonolysis of the solvent. Continued sonication results in the eventual disappearance of both C 60 and C 60 H 2 from the solution as monitored by UV-vis spectrophotometry. This disappearance, along with the complete absence of more highly hydrogenated derivatives, suggests that the C 60 experiences a high-energy environment during ultrasonic irradiation.

The excited state absorption spectrum ofSm 2 + diluted as an impurity in the single crystal hosts SrF2 and SrCl 2 has been observed. The absorption peaks associated with the 5 Do( 4f6) excited state were found to be displaced by approximately 3000 cm -I from the absorption bands arising from the 7 Fo( 4r) ground state when the 5 D(J7 Fo energy was taken into account. The observed peak separation is ascribed to the 4f-Sd exchange interaction. From the measured peak positions and band intensities, the exchange energy for the Sm2+ impurity in the two host crystals was determined to be about the same order of magnitude as that expected for the free ion. The implications of the properties of the excited state absorption bands for the performance of CaF 2 :Sm 2 + and SrF 2 :Sm 2 + lasers are considered.

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