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Ikeura, Hiromi*; Sekiguchi, Tetsuhiro
Molecular Crystals and Liquid Crystals, 622(1), p.50 - 54, 2015/12
Times Cited Count：0 Percentile：0.01(Chemistry, Multidisciplinary)Organic electrically conducting 
-stacked molecules are widely regarded as promising materials for future application of nanoelectronics. Direct measurements of electronic structures of unoccupied states in organic semiconductors lead to better understanding of mechanism of electron conduction. For probing unoccupied partial density of states (DOS), X-ray absorption spectroscopy (XAS) is commonly used, where selective excitation of the 1s core electron to the unoccupied conduction band is possible. However, XAS cannot distinguish localized and delocalized features without comparing any theoretical approach. In this work, the core-hole-clock method in resonant Auger spectroscopy (RAS) has been applied to probe electron delocalization through the empty conduction band in the attosecond domain for the purpose of exploring electronic materials with high-speed electron transport. We will discuss some organic molecules such as pentacenes.
Yoshii, Kenji; Baba, Yuji; Sasaki, Teikichi
Journal of Electron Spectroscopy and Related Phenomena, 93, p.105 - 108, 1998/00
Times Cited Count：2 Percentile：11.16(Spectroscopy)no abstracts in English
*; Noro, Hisato*; Nagoshi, Masayasu*; Yamamoto, Hiroyuki; Baba, Yuji; Sasaki, Teikichi
Journal of Electron Spectroscopy and Related Phenomena, 88-91, p.467 - 471, 1998/00
Times Cited Count：9 Percentile：41.19(Spectroscopy)no abstracts in English
Yoshii, Kenji; Baba, Yuji; Sasaki, Teikichi
Physica Status Solidi (B), 206, p.811 - 822, 1998/00
Times Cited Count：11 Percentile：53.44(Physics, Condensed Matter)no abstracts in English
Okude, Nobuya*; Noro, Hisato*; Nagoshi, Masayasu*; Yamamoto, Hiroyuki; Baba, Yuji; Sasaki, Teikichi
Photon Factory Activity Report, (14), P. 430, 1996/00
no abstracts in English
Yoshii, Kenji; Baba, Yuji; Sasaki, Teikichi
Hyomen Kagaku, 16(7), p.453 - 457, 1995/07
no abstracts in English
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)Yoshii, Kenji; Baba, Yuji; Sasaki, Teikichi
Hyomen Kagaku, 15(5), p.295 - 299, 1994/07
no abstracts in English
Ikeura, Hiromi*; Sekiguchi, Tetsuhiro
no journal, ,
Many peaks are observed in X-ray absorption fine structure near the inner-shall edges. Such fine structures are called near-edge X-rays absorption fine structure or abbreviated as NEXAFS. NEXAFS spectra provide us with information on property of electronic states concerning partial density of states of unoccupied conduction band for materials. In this work, we have investigated several sulfur-containing thiophene derivative polymers using NEXAFS spectroscopy. We have recorded the S K-edge NEXAFS spectra of film samples of these electronic materials and tried to interpret the origin of electronic transition seen in NEXAFS on the basis of molecular orbital theory. Furthermore, we discuss whether there is a potential relation between the observed spectra and charge-transfer property of the materials.
