In-Situ Infrared Transmission Study of Rb- and K-Doped Fullerenes

Abstract

We have measured the four IR active $C_{60}$ molecular vibrations in $M_x{C}_{60}$ $(M=K,Rb)$ as a function of doping $x$. We observe discontinuous changes in the vibrational spectra showing four distinct phases (presumably $x=0,3,4$, and 6). The $1427c{m}^{-1}$ and $576c{m}^{-1}$ modes show the largest changes shifting downward in frequency in four steps as the doping increases. Several new very weak modes are visible in the $x=6$ phase and are possibly Raman modes becoming weakly optically active. We present quantitative fits of the data and calculate the electron-phonon coupling of the $1427c{m}^{-1}$ IR mode.

3 pages, Figure 1 included, 3 more figures available by request. REVTEX v3.0 IRC60DOP

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