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The infrared- and Raman-active vibrational modes of C60 were measured in thevarious structural states of Rb1C60. According to earlier studies, Rb1C60 hasan $fcc$ structure at temperatures above ~100C, a linear chain polymerorthorhombic structure when slowly cooled, and an as yet undetermined structurewhen very rapidly cooled ("quenched"). We show that the spectra obtained in thepolymer state are consistent with each C60 molecule having bonds to twodiametrically opposite neighbors. In the quenched state, we find evidence forfurther symmetry breaking, implying a lower symmetry structure than the polymerstate. The spectroscopic data of the quenched phase are shown to be consistentwith Rb2(C60)2, a dimerization of C60.

physical review. b, condensed matter

Infrared and Raman evidence for dimers and polymers in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RbC</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Infrared and Raman evidence for dimers and polymers inRbC60