論文 - 中嶋　敦

Photoelectron Spectroscopy of Binary Silicon Cluster Anions

A. Nakajima, N. Zhang, H. Kawamata, T. Hayase, K. Kaya

T. Kondow et al.（eds.）”Structures and Dynamics of Clusters” frontiers science series （Universal Academy Press）   （ 16 ） 377 - 382 1996年05月

論文集(書籍)内論文, 共著, 筆頭著者

　概要を見る

シリコンに他元素を混ぜた２成分クラスターを生成させ、その負イオンの光電子分光によって電子状態変化を観測し、異原子ドープの影響を論じた。

Photoelectron spectroscopy of iron-sulfur cluster anions

N. Zhang, T. Hayase, H. Kawamata, K. Nakao, A. Nakajima, K. Kaya

Journal of Chemical Physics （American Institute of Physics）  104 （ 10 ） 3413 - 3419 1996年03月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  0021-9606

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Iron-sulfur cluster anions (FenSm-, n=1-6, m=1-6) have been studied using photoelectron spectroscopy (PES) with a magnetic-bottle-type time-of-flight electron spectrometer. The FenSm-. cluster anions were formed in a laser vaporization cluster source. It was found that the stable cluster ions are the ones with compositions of n=m and n=m±1. The electron affinities were measured from the onsets of the PES spectra. Three low-lying electronic states were observed for FeS. The PES spectra of FenS- (n=1-4) series show a unique similarity, indicating that the Fe atom addition to FeS- has little effect on the electronic property of FeS. The PES spectra of FenS2- series show a similarity among the cluster anions with n=2-4, showing that Fe2S2- is the structural framework of these clusters. For FenS3- series, Fe3S3- is proposed to be the structural framework. The electronic properties and geometrical structures of the clusters are discussed. © 1996 American Institute of Physics.

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Structures of organometallic clusters: V_n(benzene)_m and Co_n(benzene)_m

K. Hoshino, T. Kurikawa, H. Takeda, A. Nakajima, K. Kaya

Surface Review and Letters （World Scientific Publishing）  3 （ 1 ） 183 - 185 1996年02月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  0218625X

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Metal-molecule clusters, Vn(benzene)m, Con(benzene)m, and their ions, were synthesized by the reaction of laser-vaporized vanadium atoms with benzene vapor. Both neutral and cationic Vn(benzene)m clusters exhibit magic number behavior at m = n + 1 (n = 1-5), which was explicable in terms of multiple-decker sandwich structure.

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Photoelectron spectroscopy of silicon-carbon cluster anions

A. Nakajima, T. Taguwa, K. Nakao, M. Gomei, R. Kishi, S. Iwata, K. Kaya

Surface Review and Letters （World Scientific Publishing）  3 （ 1 ） 411 - 415 1996年02月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  0218-625X

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Photoelectron spectra of CnSim- cluster anions (3≤ n, m ≤6) were measured at the photon energy of 3.49 eV, by using a magnetic-bottle electron spectrometer having ∼60-meV resolution. The CnSim- clusters were produced by laser vaporization of a carbon-silicon mixture rod in a He carrier gas. The spectra of the C1Sim-1- clusters are similar to those of pure Si-m clusters in the peak positions and their envelopes, which is attributed to the similarity in electronic structure of Si and C atoms, leading to a similar geometry. In contrast, the similarity in the photoelectron spectra is not observed between C-n and Cn-1Si1- clusters, which is attributed to a change in their geometry; from chain to ring.

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Electron-correlation effects on geometrical and electronic structures of Si_nNa clusters

R. Kishi, A. Nakajima, S. Iwata, K. Kaya

Surface Review and Letters （World Scientific Publishing）  3 （ 1 ） 365 - 369 1996年02月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  0218-625X

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<p>The geometries and energies of silicon-sodium binary clusters (Si_nNa, n = 2-7) were investigated with the inclusion of electron-correlation effects using the second-order Møller-Plesset perturbation theory (MP2) with the 6-31G basis set. In addition, the fourth-order (MP4) energies were evaluated to determine the ground-state isomers. Si₄Na cluster was calculated with the polarized 6-31G* basis set. For all of the Si_nNa clusters, the most stable isomers have bridge-site type structures. Apart from the bridge-site type Si₆Na, the structure of the most stable isomer of Si_nNa keeps the frame of the corresponding Si_n cluster unchanged, and the electronic structure of Si_nNa is similar to that of the corresponding negative ion Si^-
_n. The silicon framework of the bridge-site type of Si₆Na is distorted from the compressed octahedron to the face-capped trigonal bipyramid.</p>

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Photoelectron spectroscopy of binary cluster anions

K. Kaya, A. Nakajima

Surface Review and Letters （World Scientific Publishing）  3 （ 1 ） 637 - 642 1996年02月

研究論文（学術雑誌）, 共著, 最終著者, 査読有り,  ISSN  0218-625X

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Photoelectron spectra of AlnSm- and SinNa-m were measured using magnetic-bottle-type photoelectron spectrometer. Sulfur atoms were found to perturb the structural factor of Al clusters and several magic number clusters such as AlS- and Al3S3- were newly observed. Sodium atoms perturb the electronic factor of Si clusters with small disturbance of the geometries of the genuine clusters.

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Photoelectron spectroscopy of binary-metal cluster anions containing sulfur atom

A. Nakajima, T. Taguwa, K. Nakao, K. Hoshino, S. Iwata, K. Kaya

Surface Review and Letters （World Scientific Publishing）  3 （ 1 ） 417 - 421 1996年02月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  0218-625X

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Photoelectron spectra of MnS-1 (M = Al, Cu, Ag, and Au) cluster anions were measured at the photon energies of 3.49 and 4.66 eV using a magnetic-bottle electron spectrometer having ∼60-meV resolution. The electron affinities of AlS-, CuS-, AgS-, and AuS- are 2.60(3), 2.10(3), 2.09(3), and 2.44(3) eV, respectively. The large EA of AlS- is attributed to large stability by six bonding electrons, and a new electronic state of A′2Π can be found 0.4 eV above the AlS ground state, which is in agreement with a theoretical calculation. In the photoelectron spectrum of AuS-, two peaks due to a splitting by the L-S coupling could be observed, and the amount of the splitting is 0.18(2) eV. The results of aluminum clusters containing sulfur atom will also be presented.

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Photoelectron spectroscopy of manganese-sulfur cluster anions

N. Zhang, H. Kawamata, A. Nakajima, K. Kaya

Journal of Chemical Physics （American Institute of Physics）  104 （ 1 ） 36 - 41 1996年01月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  0021-9606

　概要を見る

Manganese-sulfur cluster anions (MnnSm-, n = 1-10, m = 1-10) have been studied using a magnetic-bottle type photoelectron spectroscopy (PES). The MnnSm- cluster anions were formed in a laser vaporization cluster source. The most stable cluster anions were found to have the compositions of n=m and n=m±1. The electron affinities of neutral manganese sulfide clusters were measured from the onsets of the PES spectra. A new electronically excited state at 0.75 eV above the ground state was found for MnS. From the size dependence of the PES spectra, it was found that Mn2S2-, Mn3S3-, and Mn4S4- are structural frameworks in MnnS2-, MnnS3-, and MnnS4- series, respectively. The electronic properties and geometrical structures of the clusters are discussed. © 1996 American Institute of Physics.

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Structures and ionization energies of cobalt-benzene clusters (Co_n(benzene)_m)

T. Kurikawa, M. Hirano, H. Takeda, K. Yagi, K. Hoshino, A. Nakajima, K. Kaya

Journal of Physical Chemistry （American Chemical Society）  99 （ 44 ） 16248 - 16252 1995年11月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00223654

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Cobalt-benzene clusters, Con(benzene)m, were synthesized by the reaction of laser-vaporized Co atoms with benzene vapor. The clusters exhibit magic-number behavior not only at m = n + 1 (n = 1-3) but also at (n-m) = (3-3), (4-4), (5-4), (6-4), (7-4), (8-5), and (9-6). Observed magic-number behavior and ionization energies are consistently explained by assuming the structure of the clusters to be multiple-decker sandwiches for n-m (m = n + 1, n = 1 - 3) and to be an n atom metal cluster coated by m benzene molecules for n-m (n ≥ 4). In this paper, we will present the properties of Con(benzene)m clusters from the viewpoints of mass distribution, reactivity, and ionization energies. The structure and formation mechanism of the Con(benzene)m clusters will also be discussed. © 1995 American Chemical Society.

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Photoelectron spectroscopy of silicon-carbon cluster anions (Si_nC_m^-)

A. Nakajima, T. Taguwa, K. Nakao, M. Gomei, R. Kishi, S. Iwata, K. Kaya

The Journal of Chemical Physics （American Institute of Physics）  103 （ 6 ） 2050 - 2057 1995年08月

研究論文（学術雑誌）, 共著, 最終著者, 責任著者, 査読有り,  ISSN  00219606

　概要を見る

Photoelectron spectra of Sin,Cm- cluster anions (1≤n≤7 and 1≤m≤5) were measured at the photon energies of 3.49 eV, by using a magnetic bottle electron spectrometer. The Si nCm- clusters were produced either by a laser vaporization of a silicon-carbon mixed rod or by two laser vaporizations of carbon and silicon rods in a He carrier gas. The spectra of the Si nC1- (3≤n≤7) clusters are similar to those of pure Sin+1- clusters in the peak positions and their envelopes, which is attributed to the isovalent electronic structure of Si and C atoms as well as to the similar geometrical structure. In contrast, the similarity in the photoelectron spectra is not observed between Cm+1 and Si1Cm (2≤m≤5) clusters, which is attributed to a change in their geometry; from chain to ring. These experimental conclusions are discussed with the results of our theoretical calculations. © 1995 American Institute of Physics.

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Photoelectron spectroscopy and mass distributions of aluminum-sulfur cluster anions (Al_nS_m^-)

A. Nakajima, N. Zhang, H. Kawamata, T. Hayase, K. Nakao, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  241 （ 4 ） 295 - 300 1995年07月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  00092614

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Photoelectron spectra of AlnSm- cluster anions (0 ≤ n, m ≤ 10) were measured at photon energies of 3.49 and 4.66 eV, by using a magnetic bottle electron spectrometer. The AlnSm-. clusters were produced by laser vaporization of an aluminum-sulfur mixed rod in He carrier gas. The abundant AInSM clusters are three types of AlS-(Al2S3)k, AlS2-(Al2S3)k, and (Al2S3)k-, where an unit of Al2S3 aggregates with ion cores of AlS-, AlS2-, and Al2S3, respectively. Al3S3 is exceptionally stable with its geometrical structure. © 1995.

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Ionization energies of cobalt-vanadium bimetallic clusters (Co_nV_m)

K. Hoshino, T. Naganuma, K. Watanabe, Y. Konishi, A. Nakajima, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  239 （ 4-6 ） 369 - 372 1995年06月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00092614

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The ionization energies (Ei) for bimetallic clusters of cobalt and vanadium (ConVm) were determined by photoionization spectroscopy. A comparison of Ei values to the hydrogen chemisorption reactivity reveals no correlation, indicating the importance of inhomogeneity of bimetallic clusters. © 1995.

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Structures and ionization energies of sandwich clusters (V_n(benzene)_m)

K. Hoshino, T. Kurikawa, H. Takeda, A. Nakajima, K. Kaya

Journal of Physical Chemistry （American Chemical Society）  99 （ 10 ） 3053 - 3055 1995年03月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00223654

　概要を見る

Metal-molecule clusters Vn(benzene)m were synthesized by the reaction of laser-vaporized vanadium atoms with benzene vapor. The clusters exhibit magic number behavior at m = n - 1, n, and n + 1 (n = 1-5), which is explicable in terms of the multiple decker sandwich structure for these stable clusters. The ionization energies of these sandwich clusters decrease significantly with increasing cluster size. © 1995 American Chemical Society.

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Photoelectron spectroscopy of Al_nS₁^- clusters (n = 1-9)

A. Nakajima, T. Taguwa, K. Nakao, K. Hoshino, S. Iwata, K. Kaya

The Journal of Chemical Physics （American Institute of Physics）  102 （ 2 ） 660 - 665 1995年01月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  00219606

　概要を見る

Photoelectron spectra of AlnS1 (1≤n≤9) cluster anions were measured at the photon energies of 3.49 and 4.66 eV, using a magnetic bottle electron spectrometer having ∼60 meV resolution. AlS - has an electron affinity of as large as 2.6 eV, attributed to large stability by six bonding electrons. A new electronic state, A′ 2Π, was found 0.4 eV above the AlS ground state, which is in agreement with theoretical calculations. AlnS1- cluster anions are produced efficiently up to n=5, but the production of larger cluster sizes is found difficult. The mass distribution of AlnS 1- cluster anions and electron binding energy can be explained by a geometric structure obtained by theoretical calculation. © 1995 American Institute of Physics.

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Spectroscopic Study of Hydrogen Bonded7-Azaindole Clusters

A. Nakajima, F. Ono, Y. Kihara, A. Ogawa, K. Matsubara, K. Ishikawa, M. Baba, K. Kaya

Laser Chemistry （Wiley-VCH Verlag GMBH）  15 （ 2-4 ） 167 - 181 1995年01月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  0278-6273

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Ionization energies of aluminum-cesium bimetallic clusters (Al_nCs_m)

K. Hoshino, K. Watanabe, Y. Konishi, T. Taguwa, A. Nakajima, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  231 （ 4-6 ） 499 - 503 1994年12月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00092614

　概要を見る

Aluminum-cesium bimetallic clusters (AlnCsm) were produced by the combination of laser vaporization and a high-temperature pulsed nozzle. To investigate their electronic structures, ionization energies (EiS) of the AlnCsm clusters were measured using a tunable ultraviolet laser combined with a time-of-flight mass spectrometer. In general, their Eis decrease by 0.4-1.0 eV with increasing number of cesium atoms, but discontinuous changes in Eis can be also observed, which are attributed to electronic shell structures; completeness of electron shell by the addition of a Cs atom induces high Ei, and an excess electron from the Cs atom results in large Ei, decrement. The electronic stability of the AlnCsmclusters can be also examined by their abundance. © 1994.

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Photoelectron Spectroscopy of AlS^- Diatomic Anion

A. Nakajima, T. Taguwa, K. Nakao, K. Hoshino, S. Iwata, K. Kaya

Chemistry Letters （Chemical Society of Japan）  1994 （ 8 ） 1525 - 1528 1994年08月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  0366-7022

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アルミニウムー硫黄の２原子ラジカル負イオンＡｌＳ-の光電子スペクトルを測定し、電子親和力を決定するとともに電子励起状態を明らかにし、理論計算で解釈した。

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Theoretical study of silicon sodium binary clusters. Geometrical and electronic structures of Si_nNa (n = 1-7)

R. Kishi, A. Nakajima, S. Iwata, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  224 （ 1-2 ） 200 - 206 1994年07月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00092614

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The geometries, ionization energies and adsorption energies of siliconsodium binary clusters (SinNa, n=1-7) were studied with ab initio MO calculations. All the calculations were carried out at the restricted Hartree-Fock level of approximation for both closed and open shell systems. The structure of the most stable isomer of the SinNa clusters keeps the frame of the corresponding Si cluster unchanged. The electronic structure of SinNa is similar to that of the corresponding negative ions Si-n. The ionization energies of SinNa were evaluated with the ΔSCF method, and they become smaller than that of the corresponding Sin as was reported experimentally. © 1994.

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Photoionization electronic spectroscopy of AlNa

A. Nakajima, K. Hoshino, K. Watanabe, Y. Konishi, T. Kurikawa, S. Iwata, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  222 （ 4 ） 353 - 357 1994年05月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  0009-2614

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Two electronic transitions are observed for a new heteronuclear dimer, AlNa, using two-color two-photon ionization spectrocopy (2R2PI). The combination of the analysis of vibronic structure and ab initio calculation enables us to assign the two transitions as D 1Π←X 1Σ+ and C 1Σ+←X 1Σ+; the origins of the D and C states are located at 16427 and 15422 cm-1, and the vibrational frequencies being 151 cm-1 in the D state, 115 cm-1 in the C state, and 186 cm-1 in the X state, respectively. © 1994.

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Photoelectron spectroscopy of iron carbonyl cluster anions (Fe_n(CO)_m^-, n = 1-4)

A. Nakajima, T. Taguwa, K. Kaya

Chemical Physics Letters （Elsevier Science BV）  221 （ 5-6 ） 436 - 440 1994年04月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り,  ISSN  00092614

　概要を見る

Photoelectron spectra of iron-carbonyl cluster anions (Fen(CO)-m) were measured in the gas phase at the photon energy of 4.66 eV, using a magnetic bottle electron spectrometer. The iron-carbonyl cluster anions were produced by slow electron attachment of less than 1 eV to a supersonic expansion of Fe(CO)5 seeded in a He carrier gas. The photoelectron spectra of the Fen(CO)- 5n-1 anions show unresolved broad features, and the threshold energy (ET) and the vertical detachment energy (VDE) were determined: The ET of Fen(CO)-5n-1 gradually increases by 0.1-0.3 eV with the cluster size. The study suggests that the iron carbonyl cluster anions produced are van der Waals clusters, in which Fe(CO)-4 works as an ion core. © 1994.

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