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Journal Articles

Mechanism of state-specific enhancement in photon-stimulated desorption as studied using a polarization-dependent technique

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Wu, G.*; Kitajima, Yoshinori*

Surface Science, 593(1-3), p.310 - 317, 2005/11

 Times Cited Count:2 Percentile:12.3(Chemistry, Physical)

Using a newly developed rotatable time-of-flight mass spectrometer(R-TOF-MS) and polarized synchrotron radiation, orientation effect on fragmentation and desorption pathways occurring at the top-most layers of molecular solids have been investigated. Reported will be polarization-angle dependencies of TOF mass spectra, high-resolution electron- and ion-NEXAFS in condensed chlorobenzene.

Journal Articles

Direct and indirect processes in photon-stimulated ion desorption from condensed formamide

Ikeura, Hiromi*; Sekiguchi, Tetsuhiro; Baba, Yuji; Imamura, Motoyasu*; Matsubayashi, Nobuyuki*; Shimada, Hiromichi*

Surface Science, 593(1-3), p.303 - 309, 2005/11

 Times Cited Count:5 Percentile:27.34(Chemistry, Physical)

no abstracts in English

Journal Articles

Local bonding states of ion-irradiated graphite characterized by photon-stimulated desorption (PSD) spectroscopy

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.437 - 441, 2005/06

 Times Cited Count:3 Percentile:18.36(Spectroscopy)

no abstracts in English

Journal Articles

Characterization and degradation of ZEP520 resist film by TOF-PSID and NEXAFS

Ikeura, Hiromi*; Sekiguchi, Tetsuhiro; Koike, Masaki*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.453 - 455, 2005/06

 Times Cited Count:15 Percentile:59.09(Spectroscopy)

no abstracts in English

Journal Articles

Polarization-dependent dissociation selectively induced by core-electron excitation in methyl ester terminated self-assembled monolayer

Kizaki, Hiroyuki*; Wada, Shinichi*; Sako, Erika*; Sumii, Ryohei*; Waki, Satoshi*; Isari, Koji*; Sekitani, Tetsuji*; Sekiguchi, Tetsuhiro; Tanaka, Kenichiro*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.447 - 451, 2005/06

 Times Cited Count:5 Percentile:28.59(Spectroscopy)

no abstracts in English

Journal Articles

Fragmentation pathways caused by soft X-ray irradiation; The detection of desorption products using a rotatable time-of-flight mass-spectrometer combined with pulsed synchrotron radiation

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.

Free Electron lasers 2003, p.II_69 - II_70, 2004/00

no abstracts in English

Journal Articles

Element- and orientation-selective photo-fragmentation using polarized synchrotron radiation

Sekiguchi, Tetsuhiro; Ikeura-Sekiguchi, Hiromi*; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.

Photon Factory Activity Report 2002, Part B, P. 80, 2003/11

no abstracts in English

Journal Articles

Orientation effect on phot-fragmentation and ion-desorption from the topmost layers of molecular solids

Sekiguchi, Tetsuhiro; Ikeura, Hiromi*; Baba, Yuji

Surface Science, 532-535(1-3), p.1079 - 1084, 2003/06

Using a newly developed rotatable time-of-flight mass spectrometer(R-TOF-MS) and polarized synchrotron radiation, we have investigated orientation effect on fragmentation and desorption pathways occurring at the top-most layers of molecular solids. Reported will be polarization-angle dependencies of TOF mass spectra, high-resolution electron- and ion-NEXAFS in condensed formic acid, formamide and benzene. For condensed formamide(HCOND$$_{2}$$), marked orientation effect was observed for the enhanced H$$^{+}$$-yields following C1s $$rightarrow$$ $$sigma$$*$$_{C-H}$$ resonance. Direct photodissociation and charge-neutralization play an important role in the effect. For some fragment species, however, the bond scission showed no polarization dependence when dissociation sites were far from core-excited atoms. This is the case for N-D scission and D$$^{+}$$-desorption following C1s excitation, suggesting that indirect process governs, where secondary electrons would induce the fragmentation.

Journal Articles

Active control of chemical bond scission by site-specific core excitation

Wada, Shinichi*; Sumii, Ryohei*; Isari, Koji*; Waki, Satoshi*; Sako, Erika*; Sekiguchi, Tetsuhiro; Sekitani, Tetsuji*; Tanaka, Kenichiro*

Surface Science, 528(1-3), p.242 - 248, 2003/03

 Times Cited Count:44 Percentile:85.05(Chemistry, Physical)

no abstracts in English

Journal Articles

Active control of site specificity in ion desorption by core excitation

Wada, Shinichi*; Sako, Erika*; Sumii, Ryohei*; Waki, Satoshi*; Isari, Koji*; Sekiguchi, Tetsuhiro; Sekitani, Tetsuji*; Tanaka, Kenichiro*

Nuclear Instruments and Methods in Physics Research B, 199, p.361 - 365, 2003/01

 Times Cited Count:11 Percentile:61.24(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Fragment-ion desorption from sulfur-containing amino acids by localized core-level excitation

Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao

Surface Review and Letters, 9(1), p.77 - 83, 2002/02

 Times Cited Count:4 Percentile:26.99(Chemistry, Physical)

no abstracts in English

Journal Articles

Site-specific fragmentation of acetone adsorbates on Si(100) in the carbon 1s absorption edge

Sekiguchi, Tetsuhiro; Sekiguchi, Hiromi*; Baba, Yuji

Surface Science, 454-456, p.363 - 368, 2000/05

 Times Cited Count:23 Percentile:73.42(Chemistry, Physical)

no abstracts in English

Journal Articles

Desorption of fragment ions from condensed Si(OCH$$_{3}$$)$$_{4}$$ by localized inner-shell electron excitation at the silicon, oxygen and carbon K-edges

Baba, Yuji; Sekiguchi, Tetsuhiro

Journal of Vacuum Science and Technology A, 18(2), p.334 - 337, 2000/03

 Times Cited Count:4 Percentile:23.71(Materials Science, Coatings & Films)

no abstracts in English

Journal Articles

Optical ionization of DX center in AlGaAs:Se by inner-shell excitation

Yoshino, Yoko; Takarabe, Kenichi*; Ishii, Masashi*; Katayama, Yoshinori; Shimomura, Osamu

Physica B; Condensed Matter, 273-274, p.781 - 783, 1999/12

 Times Cited Count:1 Percentile:8.99(Physics, Condensed Matter)

DX state is strongly localized. This nature could be investigated by observing relaxation process of localized electrons to emptied inner shells. We have found two different optical ionization process of the DX center in Al$$_{x}$$Ga$$_{1-x}$$As:Se (x=0.33,$$N_{rm Se}=5times10^{17}$$(cm$$^{-3}$$)) by using synchrotron radiation. They are tentatively assigned to be a direct lift of an inner-shell electron to the conduction band (CB) followed by a capture of an electron at the DX center to the emptied inner shell $$({rm DX}^{-}+hnu ({rm L,} $$K-edge$$)rightarrow {rm DX}^{0}+e_{rm CB})$$ and the Auger ionization of one electron of the DX center to the CB followed by a capture of another electron to the emptied inner shell $$({rm DX}^{-}+hnu ({rm L,} $$K-edge$$)rightarrow {rm DX}^{+}+e_{rm CB}+e_{rm vacuum})$$.

Journal Articles

Screening effect of metal,semiconductor and insulator surfaces on photo-fragmentation of physisorbed molecules

Baba, Yuji; Sekiguchi, Tetsuhiro

Surface Science, 433-435, p.843 - 848, 1999/00

 Times Cited Count:6 Percentile:38.85(Chemistry, Physical)

no abstracts in English

Journal Articles

Desorption of fragment ions from mono-and multilayered CCl$$_{4}$$ on Cu(100) by inner-shell photoexcitation

Baba, Yuji; Yoshii, Kenji; Sasaki, Teikichi

Surface Science, 402-404, p.115 - 119, 1998/00

 Times Cited Count:4 Percentile:28.06(Chemistry, Physical)

no abstracts in English

Journal Articles

Decomposition of crystalline potassium hexacyanoferrate, (II); Trihydrate by Incident energetic argon ions

Ono, Shinichi;

Bulletin of the Chemical Society of Japan, 58(4), p.1100 - 1104, 1985/00

 Times Cited Count:3 Percentile:31.41(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Chemical reactions induced by low-energy ion bombardment

Ono, Shinichi

Hoshasen, 11(3), p.75 - 82, 1985/00

no abstracts in English

18 (Records 1-18 displayed on this page)
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