Single-molecule methods dynamic mode

The timescale of infrared spectroscopy is such that it is capable of detecting dynamic distortions. This method is sensitive to the local structure, so that it detects the distortions of the single molecules and not their average. The MIR spectra of the A4C60 compounds at high temperatures show a twofold split Ti (4) mode (Fig. 7) corresponding to either a T>j,d or a Dsd distortion (see Table 1.) [4,69]. The NIR spectra contain two peaks (Fig. 7), which also correspond to D d or Dsd structures (see Fig. 8) [4]. These are the distortions favored by the molecular Jahn-Teller effect. It has been shown that at high temperatures these distortions are dynamic [4]. 

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