Measurements of kinetic energy release following the unimolecular and collision‐induced dissociation of argon cluster ions, Ar+n, for n in the range 2–60
Measurements of kinetic energy release following the unimolecular and collision‐induced dissociation of argon cluster ions, Ar+n, for n in the range 2–60
复制标题
测量氩簇离子 (Ar+n) 单分子和碰撞诱导解离后的动能释放（n 在 2–60 范围内）
DOI：
10.1063/1.460632
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发表时间：
1991
影响因子：
4.4
通讯作者：
A. Stace
中科院分区：
文献类型：
--
作者：
C. A. Woodward;A. Stace
双聚焦质谱仪与团簇束源一起用于测量氩团簇离子单分子和碰撞诱导碎裂（CID）后释放的平均动能。在Ar+5-Ar+60范围内对团簇进行了单分子衰变的测量，而CID研究的范围是Ar+2-Ar+30。在观测时间窗内，通过单分子衰变损失单个氩原子的动能释放结果与统计上划分的内能一致。确定了三种不同的CID途径：（i）失去一个Ar原子;（ii）快速（10−7 s）。提出小团簇离子的CID是通过电子激发进行的，但随着团簇尺寸的增加（n>4），振动激发占主导地位。一个简单的旁观者模型的碰撞激发帐户…
A double‐focusing mass spectrometer in conjunction with a cluster beam source has been used to measure the average kinetic energy released following the unimolecular and collision‐induced fragmentation (CID) of argon cluster ions. Measurements on unimolecular decay have been made for clusters in the range Ar+5–Ar+60, and for the CID studies the range was Ar+2–Ar+30. Within the observation time window, the kinetic energy release results for the loss of a single argon atom via unimolecular decay are consistent with internal energy being partitioned statistically. Three separate CID routes are identified: (i) loss of one Ar atom; (ii) rapid ( 10−7 s. It is proposed that the CID of small cluster ions proceeds via electronic excitation; but that as the clusters increase in size (n>4) vibrational excitation predominates. A simple spectator model of collisional excitation accounts for the ...