High resolution photoelectron spectroscopy of organic conducting materials

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In order to clarify the electronic structure change around the superconductive and non superconductive phase transition temperature of organic materials, a sample holding system of a ultrahigh resolution photoelectron spectrometer was modified. After the modification, temperature of the sample holder stem went down to less than 10 K which was the aim of modification, but the sample disk itself was not cold enough to investigate the phase transition. Another modification is under the way. Parallel to the modification, photoelectron spectra of metallofullerenes and linear carbon chain molecules have been measured. Metallofullerenes consist of fullerene cages and metal atoms and metal atoms donate electron the cage. Electronic structures of metallofullerenes change drastically according to the amounts of transferred electrons and their spin states. We have clarified the electronic structures of three Tm@C82 isomers and a Pr@C82 minor isomer. We found that two electrons are transferred to the cage in Tm@C82, whereas three electrons are transferred in Pr@C82. Linear carbon chain molecules are considered to be one of prospective candidates for molecular wire. We found that the longer the chain, the less stable the highest occupied molecular orbit and these molecules can be treated as a good example of one-dimensional quantum well.