研究者詳細 - 中嶋　敦

論文 - 中嶋　敦

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Production of bimetallic clusters containing manganese atoms by laser-vaporization method

Y. Sone, K. Hoshino, T. Naganuma, A. Nakajima, K. Kaya

Journal of Physical Chemistry （American Chemical Society） 95 （ 18 ） 6830 - 6832 1991年09月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 0022-3654

Bimetallic clusters containing manganese atoms were generated by applying a laser-vaporization method. The bimetallic clusters composed of Ta and Mn, TanMnm, were produced and could be mixed in any ratio, whereas those composed of Co and Mn, ConMnm, could only be produced with more than four cobalt atoms; Co4 plays an important role in the production of ConMnm clusters. The difference of mass distribution between TanMnm and ConMnm can be qualitatively explained by an analogy of their phase diagrams in the bulk. © 1991 American Chemical Society.

Reactivity of positively charged cobalt cluster ions with CH₄, N₂, H₂, C₂H₄, and C₂H₂

A. Nakajima, T. Kishi, Y. Sone, S. Nonose, K. Kaya

Zeitschrift für Physik D Atoms, Molecules and Clusters （Springer Nature） 19 （ 4 ） 385 - 387 1991年03月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り, ISSN 0178-7683

<p>Reactivity of positively charged cobalt cluster ions (Co_n⁺, n=2-22), produce by laser vaporization, with various gas samples (CH₄, N₂, H₂, C₂H₄, and C₂H₂) were systematically investigated by using a fast-flow reactor. The reactivity of Co_n⁺ with the various gas samples is qualitatively consistent with the adsorption rate of the gas to cobalt metal surfaces. Co_n⁺ highly reacts with C₂H₂ as characterized by the adsorption rate to metal surfaces, and it indicates no size dependence. In contrast, the reactions of Co_n⁺ with the other gas samples indicate a similar cluster size dependence; at n=4, 5, and 10-15, Co_n⁺ highly reacts. The difference can be explained by the amount of the activation energy for chemisorption reaction. Compared with neutral cobalt clusters, the size dependence is almost similar except for Co₄⁺ and Co₅⁺. The reactivity enhancement of Co₄⁺ and Co₅⁺ indicates that the cobalt cluster ions are presumed to have an active site for chemisorption at n=4 and 5, induced by the influence of positive charge.</p>

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Mass distributions of aluminum negative cluster ions and their binary cluster ions mixed with a carbon atom

A. Nakajima, T. Kishi, T. Sugioka, Y. Sone, K. Kaya

Chemical Physics Letters （Elsevier Science BV） 177 （ 3 ） 297 - 300 1991年02月

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

The mass distributions of aluminum negative cluster ions and their binary cluster ions mixed with a carbon atom, generated by laser vaporization, were measured. In the range from n=5 to 70, the mass distribution of pure aluminum negative cluster ions, Al-n, exhibits one peak at n = 13 and one step between n=23 and 24. The mass distribution of the series of AlnC-, however, exhibits one peak at n=7 and one step between n=24 and 25. The absence of a peak in the series of AlnC- around n=13 can be explained by the electronic structure in relation to the electronic shell model, and both the peak and the step in the mass distribution of AlnC- clusters can be explained by their geometric structure. © 1991.

Photodissociation dynamics of NH₃, NH₂D, NHD₂, and ND₃: Rovibronic absorption analysis of the Ã-X̃ transition

A. Nakajima, K. Fuke, K. Tsukamoto, Y. Yoshida, K. Kaya

Journal of Physical Chemistry （American Chemical Society） 95 （ 2 ） 571 - 574 1991年01月

研究論文（学術雑誌）, 共著, 筆頭著者, 査読有り, ISSN 00223654

The photodissociation dynamics of Ã state ammonia molecules has been further investigated for deuterium-substituted derivatives NH2D, NHD2, and ND3 measuring the homogeneous line widths on action spectra. The line widths of the 201 vibronic band were determined to be 19, 12, and 1.3 cm-1 fwhm for NH2D, NHD2, and ND3, respectively. In consideration of our previously reported value of 26 cm-1 for NH3, the spectral line width decreases in proportion to the number of D atoms. This result shows that the dissociation rate in the Ã state is additive as for the number of H atoms, and it is explained by the fact that the zero-point energies on the potential surface of Ã state are equally shifted among deuterium-substituted ammonias. © 1991 American Chemical Society.

Electronic spectrum of jet-cooled cyanocyclopentadienyl radical

T. Ishida, H. Abe, A. Nakajima, K. Kaya

Chemical Physics Letters （Elsevier Science BV） 170 （ 5-6 ） 425 - 429 1990年07月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 0009-2614

The D1-D0 electronic spectrum of jet-cooled cyanocyclopentadienyl (C5H4CN) radical, produced by excimer laser photolysis of 1,3-cyclopentadiene-1-carbonitrile (C5H5CN), was measured by laser-induced fluorescence (LIF). The LIF spectrum was identical to that of radicals produced by photolysis of phenyl isocyanate and o-chloroaniline, which had been assigned to phenyl nitrene. This result shows that the nascent radical product in the photolysis of o-chloroaniline and phenyl isocyanate is isomerized to C5H5CN and the final product of C5H4CN radical is derived via the second photolysis. The rotational contour of the 0-0 band of the C54CN radical, at 27143 cm-1 (368.3 nm), is also presented. The electronic transition is A-type and π electron transition, and the symmetry of both the ground and excited electronic state is 2B1 (of the C2v point group). © 1990.

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Rotational distributions of CO₂⁺ (X̃ ²Π_g) produced by electron-impact ionization of supercooled CO₂

A. Nakajima, T. Nagata, T. Kondow, K. Kuchitsu

Chemical Physics Letters （Elsevier Science BV） 151 （ 6 ） 511 - 515 1988年10月

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

Laser-induced fluorescence of CO2+ (X̃ 2Πg) produced by electron impact on CO2 in a supersonic beam was measured. An analysis of the CO2+ (Ã-X̃) spectra has revealed that the rotational distribution of CO2+ is essentially Boltzmann and that the effective rotational temperature increases uniformly with decreasing impact energy, 26± 1 K at 300 eV and 31 ± 1 K at 45 eV. This trend of rotational excitation, which is similar to that observed in the N2 + e system, is interpreted in terms of the rotational transitions in electron-impact ionization. © 1988.

Nascent rotational distributions of N₂⁺(X ²Σ_g⁺) produced by electron-impact ionization of N₂ in a supersonic beam

T. Nagata, A. Nakajima, T. Kondow, K. Kuchitsu

The Journal of Chemical Physics （American Institute of Physics） 87 （ 11 ） 6507 - 6512 1987年12月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 00219606

Laser-induced fluorescence from nascent N2+(X 2Σg+) ions produced by electron impact on a N2 supersonic beam was observed. An analysis of the B 2Σu+-X 2Σ g+ (0,0) band shows that the rotational state distributions cannot be represented by a single Boltzmann function, higher N″ levels being overpopulated. Experimental and analytical efforts were made to minimize the influence of cascading and relaxation on the rotational distributions. The rotational energy of N2+ (X) thus estimated increases with decreasing electron energy from 2.26±0.16 meV at 300 eV to 4.24±0.27 meV at 25 eV. This trend is explained qualitatively in terms of angular momentum transfer through multipole electron-molecule interactions. © 1987 American Institute of Physics.

Polarized laser induced fluorescence of N₂⁺（X²Σ_g⁺) produced in the electron impact ionization of N₂

T. Nagata, A. Nakajima, T. Kondow, K. Kuchitsu

Chemistry Letters （Chemical Society of Japan） 16 （ 10 ） 1911 - 1914 1987年03月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 0366-7022

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中嶋 敦

論文 - 中嶋 敦

中嶋　敦

論文 - 中嶋　敦