XPS study of one-dimensional compounds: TiS3 |
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Authors: | Kazuhiro Endo Hideo Ihara Kazuhiro Watanabe Shun-Ichi Gonda |
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Institution: | Electrotechnical Laboratory, 1-1-4 Umezono, Sakura-mura, Ibaraki, 305 Japan |
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Abstract: | X-Ray photoelectron spectra of TiS3 with a one-dimensional structure were measured. TiS3 may be regarded as Ti4+(S2)2?S2? with pairs of S atoms (S2) and isolated S atoms. The spectra of the sulfur core-levels are assigned by comparison with those of TiS2, where all S atoms are largely separated. The binding energy of the S2 pairs is found to be 1.4 eV higher than that of the isolated S atoms, which is consistent with the larger negative charge of the isolated atoms. The structures of the valence band of TiS3 are discussed in terms of a molecular orbital scheme for the S2 pairs. |
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