By M. Cardona, G. Güntherodt

With contributions by means of various specialists

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Fine structure in the vicinity of coo is indicated by arrows. 81]. In addition, a number of smaller structures is observed, especially at low phonon frequencies. Consistent with the identification of the dominant structural features in Fig. 83]. Consistent with this interpretation is the increase in intensity of all the spectral features of Fig. 18 with increasing intercalate concentration. 81], while the mode frequencies for all the spectral features in Fig. 18 are essentially independent of intercalate concentration.

79]) 1800 Raman shift (cm -1) between the calculated and experimental lineshapes over the large frequency range 700 < co < 3700 cm - 1 (Fig. 17) provides strong evidence that the BreitWigner-Fano lineshape is due to coupling to a frequency-dependent continuum of phonon states. The connection of this continuum of phonon states to the second-order spectrum is discussed further in Sect. 5. 79] were able to deduce the discrete mode frequency co(/~2g=) in the limit of zero coupling to the continuum, yielding a value of 1585 c m - i.

2. The resulting model in turn makes predictions about the effect of intercalation on graphite mode frequencies, thereby suggesting new light scattering experiments in these materials. 24 M. S. Dresselhaus and G. ~/~ ~-. o,o I I I I 1550 1590 1630 1670 Rnmanshifl (cmq) Fig. 12. Unpolarized room temperature Raman spectra taken by Underhill et al. 59] in the backscattering geometry (E_l_c)for stage n = l, 2, 3, 4, 6, and 11 graphiteferric chloride compounds and for pristine graphite (HOPG). Laser excitation at 4880A and a power level < 50 mW were used to excitein-plane Raman-activeE2o~ modes (see inset).

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