Far infrared transmittance of Sc2@C84 and Er2@C82

Abstract We have measured the far infrared transmittance of Sc 2 @C 84 and Er 2 @C 82 at 1.5 K between 30 and 200 cm −1 . Both materials are observed to have a large primary absorption feature centered at 95 cm −1 with a width of approximately 50 cm −1 , as well as a number of secondary absorption features which are different in the two materials. This is the first study of the far infrared properties of metallofullerenes and may help in the determination of the structural and electronic properties of these materials.