作者:P. Scheier、A. Stamatovic、T.D. Märk
DOI:10.1016/0009-2614(88)87101-x
日期:1988.2
Waals clusters. The appearance energy AE of ((O2)n· O)2+ is shifted well below the appearance energy of O2+ from O2. This is in accordance with a recently suggested sequential ionization mechanism for the production of stable doubly charged cluster ions. Moreover, the shape of the ionization cross section curve of singly charged cluster ions indicates that above the appearance energy of doubly charged
使用电子碰撞电离质谱法研究了由超音速喷嘴膨胀产生的(O 2)n分子团簇。质谱图(n最高为110)显示了三个同源序列,由(O 2)n +,((O 2)n ·O)+和((O 2)n ·O)2+离子组成。对于双电荷,化学计量和碎片的O 2簇离子,发现的临界外观尺寸为n 2 = 92。这证实了最近关于n 2的预测在范德华星团中。的外观能量AE((O 2)ñ ·O)2+偏移远低于0的外观能量2+选自O 2。这与最近提出的用于产生稳定的双电荷团簇离子的顺序电离机理一致。此外,单电荷团簇离子的电离横截面曲线的形状表明,在双电荷离子的出现能之上,通过不稳定的双电荷离子的库仑爆炸产生了相当数量的单电荷离子。