Abstract

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Plenary Lectures: Award Lectures
Oral Sessions Day1, Day2, Day3: Poster Presentations Day1, Day2, Day3
Workshop: Luncheon Seminars Day1, Day2, Day3
Timetable

Oral Sessions

Day 3, May 19（Fri.）　10:10-10:30　Room D (202)

3D-O1-1010　　PDF

Structures and Reactivities of Metal Oxide Cluster Ions Studied by Ion Mobility Mass Spectrometry

(Tohoku Univ.)
^oKeijiro Ohshimo, Shohei Azuma, Ryoichi Moriyama, Motoyoshi Nakano, Fuminori Misaizu

Structures and CO-oxidation reactions of nickel oxide cluster anions were investigated by ion mobility mass spectrometry. The series of Ni_nO_n^- and Ni_nO_n+1^- (n = 1-8) cluster anions were predominantly observed in a mass spectrum. From the arrival time distributions of Ni_nO_n^- and Ni_nO_n+1^- in the ion mobility spectrometry, we determined the collision cross sections (CCSs) of these cluster ions with a helium buffer gas atom. By comparing the experimental CCSs and theoretical ones, two-dimensional sheet-like structures were assigned to the stable structures of Ni_nO_n^- (n = 4-7). These stable structures have the cyclic Ni₄O₄^- core. By adding CO gas to buffer gas in the ion-drift cell, Ni₃O₄^-, Ni₄O₅^- and Ni₅O₆^- cluster anions were observed to be more reactive in the CO-oxidation reaction than NiO₂^- and Ni₂O₃^-. This cluster-size dependence of the reactivity was found to be related with the energy difference between reactant and product calculated by theoretical calculations.