Tohoku University · 화학
미사이즈 후미노리 교수의 연구실은 주로 클러스터 이온의 전자구조와 해리 동역학을 중심으로 연구를 진행하고 있습니다. 특히 마그네슘 수화 이온(Mg⁺(H₂O)ₙ)과 암모니아 클러스터의 광해리 및 다광자 이온화 메커니즘을 고해상도 질량 분석 및 광학 측정 기법을 통해 규명하고 있습니다. 또한, 이들의 기하학적 구조와 안정성은 이온 이동도 질량 분석법을 통해 분석되며, 반응성과 에너지 분포의 변화를 정량적으로 분석합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Photodissociation spectra of Mg+(H2O)n (n=1–5) cluster ions were examined in the wavelength region from 720 to 250 nm by monitoring the total yield of the fragment ions. The absorption bands exhibit redshifts as large as 17 000 cm−1 with respect to the 2P–2S resonance line of the free Mg+ ion and were explained by the shift of this transition as a result of hydration. The spectra also exhibit clear evolution of solvation shell with the first shell closing at n=3, being consistent with the theore
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotodissociation of size-selected aquamagnesium (Mg+(H2O)n) ions for n = 1 and 2Fuminori Misaizu, Masaomi Sanekata, Keizo Tsukamoto, Kiyokazu Fuke, and Suehiro IwataCite this: J. Phys. Chem. 1992, 96, 21, 8259–8264Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://pubs.acs.org/doi/10.1021/j100200a012https://doi.org/10.1021/j100200a012research-articleACS PublicationsRequest reus
The mechanism of the resonance-enhanced two-photon ionization (RE2PI) and the dissociation of ammonia clusters has been investigated by using the two-color ionization technique and the reflectron time-of-flight mass spectrometer. The clusters are firstly excited to the intermediate state corresponding to the à 1A2 state of an ammonia molecule. The lifetime of the intermediate species is found to be <10 ns for the production of NH4+ and (NH3)2+, and longer than 1 μs for (NH3)nNH4+ (1≤n≤6)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDissociation dynamics and multiphoton ionization mechanism of ammonia clustersF. Misaizu, P. L. Houston, N. Nishi, H. Shinohara, T. Kondow, and M. KinoshitaCite this: J. Phys. Chem. 1989, 93, 20, 7041–7044Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published inissue 1 October 1989https://doi.org/10.1021/j100357a002RIGHTS & PERMISSIONSArticle Views135Altmetric-Citations27LEARN ABOUT THESE METRICSArticle Views ar
Herein, the compositions and geometrical structures of niobium oxide cluster ions were studied and compared with those of the lighter Group 5 counterpart vanadium oxide cluster ions by ion-mobility mass spectrometry (IM-MS). As a result of collision-induced dissociation in IM-MS, the compositions were found to be dependent on an odd and even number of niobium atoms, whereby the ions with (NbO<sub>2</sub>)(Nb<sub>2</sub>O<sub>5</sub>)<sub>(m-1)/2</sub><sup>+</sup> and (NbO<sub>3</sub>)(Nb<sub>2</
Negative ions of CO2 clusters (CO2)m produced by electron transfer from highly excited Rydberg atoms were investigated by mass spectrometry. The relative intensities of (CO2)−n (n≥3) (size distribution) showed a characteristic structure with magic numbers at 9, 14, and 16. The dependence of the intensities of (CO2)−n (n=7–20) on the stagnation pressure of the cluster beam source was measured. The threshold pressure at which a cluster anion of a given size started to appear increased irregularly
Negative‐ion photoelectron spectroscopy has been applied in order to obtain size dependent information about the electronic structure of clusters of metal atoms solvated with polar molecules. In the present paper we have investigated the photoelectron spectra of Cu 2 - , cluster ions with 2 = 0–4 and also those of Cu 2 - , with n = 0 and 1. In the spectra of Cu 2 - , the lowest energy bands were assigned to the electron detachment from the CuOH - , which were produced in the source together with
Stable compositions and structures of copper oxide cluster cations have been studied by ion mobility mass spectrometry (IMMS) and density functional theory calculations. Cluster ions of the series Cu <i><sub>n</sub></i> O <i><sub>m</sub></i> <sup>+</sup> were predominantly observed with <i>n:m</i> ≈ 2:1 in the mass spectrum. Collision cross sections (CCSs) of the cluster ions with <i>n:m</i> ≈ 2:1, determined by IMMS, were found to increase monotonically with cluster size. In addition, the CCSs
The electronic structures of hydrated metal-atom clusters have been investigated by negative-ion photoelectron spectroscopy. We have obtained the photoelectron spectra of Cu − ( H 2 O ) n with n=0−4 and Na − ( H 2 O ) n with n=0−12. For the former clusters, we also detected the electron detachment from the CuOH − ( H 2 O ) n−1 which coexists with Cu − ( H 2 O ) n . The observed bands for both Cu − ( H 2 O ) n and Na − ( H 2 O ) n were all assigned to the transitions to the states originating in
