Dissociation energies for carbon cluster ions (C+2–15): A system where photodissociation is misleading
Dissociation energies for carbon cluster ions (C+2–15): A system where photodissociation is misleading
复制标题
碳簇离子 (C+2–15) 的解离能：光解离具有误导性的系统
DOI：
10.1063/1.461743
复制
发表时间：
1991
影响因子：
4.4
通讯作者：
S. Anderson
中科院分区：
文献类型：
--
作者：
M. Sowa;P. A. Hintz;S. Anderson
这封信报告了碳簇离子 C+n (n = 2-15) 稳定性和碎片模式的碰撞诱导解离研究。对于六个或更多原子的簇，主要的碎裂通道是失去 C3 中性。分析碎片阈值以产生解离能，发现解离能远高于 Geusic 等人的光解离实验估计的上限。 [Z。物理。 D 3, 309 (1986)]，但与理论估计非常一致。稳定性剧烈振荡，有一些证据表明，当尺寸增加到 9 个原子以上时，行为会发生变化。这是最稳定的结构被认为从线性变为环状的尺寸。还进行了光解离测量，我们发现团簇在远低于 CID 阈值的光子能量下有效解离。讨论了异常光解离结果的可能原因。
This letter reports a collision‐induced dissociation study of the stabilities and fragmentation patterns for carbon cluster ions C+n (n = 2–15). For clusters of six or more atoms, the primary fragmentation channel is loss of C3 neutral. Fragmentation thresholds are analyzed to yield dissociation energies, which are found to be substantially higher than the upper limits estimated from photodissociation experiments of Geusic et al. [Z. Phys. D 3, 309 (1986)], but in good agreement with theoretical estimates. The stabilities oscillate strongly, with some evidence of a change in behavior as size increases above 9 atoms. This is the size where the most stable structure is believed to change from linear to cyclic. Photodissociation measurements were also done, and we find that the clusters dissociate efficiently at photon energies far below the CID thresholds. Possible reasons for the anomalous photodissociation results are discussed.