演題概要

オーラルセッション

第3日 5月19日(金) 10:10~10:30 D会場(202)

イオン移動度質量分析を用いた酸化金属クラスターイオンの構造と反応性の研究

(東北大院理)
o大下慶次郎東将平森山遼一中野元善美齊津文典

Structures and CO-oxidation reactions of nickel oxide cluster anions were investigated by ion mobility mass spectrometry. The series of NinOn- and NinOn+1- (n = 1-8) cluster anions were predominantly observed in a mass spectrum. From the arrival time distributions of NinOn- and NinOn+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 NinOn- (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.